diff --git a/Modules/Core/Common/include/itkSimpleFilterWatcher.h b/Modules/Core/Common/include/itkSimpleFilterWatcher.h
index 91a803f7b3c..bf28d7e95d4 100644
--- a/Modules/Core/Common/include/itkSimpleFilterWatcher.h
+++ b/Modules/Core/Common/include/itkSimpleFilterWatcher.h
@@ -262,8 +262,8 @@ class ITKCommon_EXPORT SimpleFilterWatcher
   EndFilter()
   {
     m_TimeProbe.Stop();
-    std::cout << std::endl << "Filter took " << m_TimeProbe.GetMean() << " seconds.";
     std::cout << std::endl
+              << "Filter took " << m_TimeProbe.GetMean() << " seconds." << std::endl
               << "-------- End " << (m_Process.GetPointer() ? m_Process->GetNameOfClass() : "None") << " \""
               << m_Comment << "\" " << std::endl;
     if (!m_Quiet)
diff --git a/Modules/Core/Common/src/itkXMLFilterWatcher.cxx b/Modules/Core/Common/src/itkXMLFilterWatcher.cxx
index a43d42df6df..b0f6e2e18f5 100644
--- a/Modules/Core/Common/src/itkXMLFilterWatcher.cxx
+++ b/Modules/Core/Common/src/itkXMLFilterWatcher.cxx
@@ -29,8 +29,8 @@ XMLFilterWatcher::ShowProgress()
     this->SetSteps(steps);
     if (!this->GetQuiet())
     {
-      std::cout << "<filter-progress>" << this->GetProcess()->GetProgress() << "</filter-progress>" << std::endl;
-      std::cout << std::flush;
+      std::cout << "<filter-progress>" << this->GetProcess()->GetProgress() << "</filter-progress>" << std::endl
+                << std::flush;
     }
   }
 }
@@ -43,14 +43,13 @@ XMLFilterWatcher::StartFilter()
   this->GetTimeProbe().Start();
   if (!this->GetQuiet())
   {
-    std::cout << "<filter-start>" << std::endl;
-    std::cout << "<filter-name>" << (this->GetProcess() ? this->GetProcess()->GetNameOfClass() : "None")
+    std::cout << "<filter-start>" << std::endl
+              << "<filter-name>" << (this->GetProcess() ? this->GetProcess()->GetNameOfClass() : "None")
               << "</filter-name>" << std::endl;
     std::cout << "<filter-comment>"
               << " \"" << this->GetComment() << "\" "
               << "</filter-comment>" << std::endl;
-    std::cout << "</filter-start>" << std::endl;
-    std::cout << std::flush;
+    std::cout << "</filter-start>" << std::endl << std::flush;
   }
 }
 
diff --git a/Modules/Core/GPUCommon/include/itkGPUReduction.hxx b/Modules/Core/GPUCommon/include/itkGPUReduction.hxx
index b7f69cc0cd2..fb76828ba68 100644
--- a/Modules/Core/GPUCommon/include/itkGPUReduction.hxx
+++ b/Modules/Core/GPUCommon/include/itkGPUReduction.hxx
@@ -119,8 +119,7 @@ GPUReduction<TElement>::GetReductionKernel(int whichKernel, int blockSize, int i
 
   std::ostringstream defines;
 
-  defines << "#define blockSize " << blockSize << std::endl;
-  defines << "#define nIsPow2 " << isPowOf2 << std::endl;
+  defines << "#define blockSize " << blockSize << std::endl << "#define nIsPow2 " << isPowOf2 << std::endl;
 
   defines << "#define T ";
   GetTypenameInString(typeid(TElement), defines);
diff --git a/Modules/Core/GPUCommon/src/itkOpenCLUtil.cxx b/Modules/Core/GPUCommon/src/itkOpenCLUtil.cxx
index b9f937bd506..1a37e5b2ead 100644
--- a/Modules/Core/GPUCommon/src/itkOpenCLUtil.cxx
+++ b/Modules/Core/GPUCommon/src/itkOpenCLUtil.cxx
@@ -455,8 +455,8 @@ std::string
 Get64BitPragma()
 {
   std::ostringstream msg;
-  msg << "#pragma OPENCL EXTENSION cl_khr_fp64 : enable\n";
-  msg << "#pragma OPENCL EXTENSION cl_amd_fp64 : enable\n";
+  msg << "#pragma OPENCL EXTENSION cl_khr_fp64 : enable\n"
+      << "#pragma OPENCL EXTENSION cl_amd_fp64 : enable\n";
   return msg.str();
 }
 
diff --git a/Modules/Core/Mesh/include/itkVTKPolyDataWriter.hxx b/Modules/Core/Mesh/include/itkVTKPolyDataWriter.hxx
index afa4f750851..3b1daaa9f69 100644
--- a/Modules/Core/Mesh/include/itkVTKPolyDataWriter.hxx
+++ b/Modules/Core/Mesh/include/itkVTKPolyDataWriter.hxx
@@ -86,10 +86,10 @@ VTKPolyDataWriter<TInputMesh>::GenerateData()
   }
 
   outputFile.imbue(std::locale::classic());
-  outputFile << "# vtk DataFile Version 2.0" << std::endl;
-  outputFile << "File written by itkVTKPolyDataWriter" << std::endl;
-  outputFile << "ASCII" << std::endl;
-  outputFile << "DATASET POLYDATA" << std::endl;
+  outputFile << "# vtk DataFile Version 2.0" << std::endl
+             << "File written by itkVTKPolyDataWriter" << std::endl
+             << "ASCII" << std::endl
+             << "DATASET POLYDATA" << std::endl;
 
   // POINTS go first
 
@@ -171,8 +171,7 @@ VTKPolyDataWriter<TInputMesh>::GenerateData()
     // LINES
     if (numberOfEdges)
     {
-      outputFile << "LINES " << numberOfEdges << " " << 3 * numberOfEdges;
-      outputFile << std::endl;
+      outputFile << "LINES " << numberOfEdges << " " << 3 * numberOfEdges << std::endl;
 
       cellIterator = cells->Begin();
       while (cellIterator != cellEnd)
@@ -219,8 +218,8 @@ VTKPolyDataWriter<TInputMesh>::GenerateData()
         }
         ++cellIterator;
       }
-      outputFile << "POLYGONS " << numberOfPolygons << " ";
-      outputFile << totalNumberOfPointsInPolygons + numberOfPolygons; // FIXME: Is this right ?
+      outputFile << "POLYGONS " << numberOfPolygons << " "
+                 << totalNumberOfPointsInPolygons + numberOfPolygons; // FIXME: Is this right ?
       outputFile << std::endl;
 
       cellIterator = cells->Begin();
diff --git a/Modules/Core/QuadEdgeMesh/include/itkQuadEdgeMeshScalarDataVTKPolyDataWriter.hxx b/Modules/Core/QuadEdgeMesh/include/itkQuadEdgeMeshScalarDataVTKPolyDataWriter.hxx
index 5ea36283b16..9b7dff4ab69 100644
--- a/Modules/Core/QuadEdgeMesh/include/itkQuadEdgeMeshScalarDataVTKPolyDataWriter.hxx
+++ b/Modules/Core/QuadEdgeMesh/include/itkQuadEdgeMeshScalarDataVTKPolyDataWriter.hxx
@@ -52,8 +52,7 @@ QuadEdgeMeshScalarDataVTKPolyDataWriter<TMesh>::WriteCellData()
     {
       std::ofstream outputFile(this->m_FileName.c_str(), std::ios_base::app);
 
-      outputFile << "CELL_DATA " << this->m_Input->GetNumberOfFaces() << std::endl;
-      outputFile << "SCALARS ";
+      outputFile << "CELL_DATA " << this->m_Input->GetNumberOfFaces() << std::endl << "SCALARS ";
 
       if (!m_CellDataName.empty())
       {
@@ -104,8 +103,7 @@ QuadEdgeMeshScalarDataVTKPolyDataWriter<TMesh>::WritePointData()
   {
     std::ofstream outputFile(this->m_FileName.c_str(), std::ios_base::app);
 
-    outputFile << "POINT_DATA " << this->m_Input->GetNumberOfPoints() << std::endl;
-    outputFile << "SCALARS ";
+    outputFile << "POINT_DATA " << this->m_Input->GetNumberOfPoints() << std::endl << "SCALARS ";
 
     if (!m_PointDataName.empty())
     {
diff --git a/Modules/Core/SpatialObjects/include/itkSpatialObject.hxx b/Modules/Core/SpatialObjects/include/itkSpatialObject.hxx
index f8679aa64c3..68c81ffa2ad 100644
--- a/Modules/Core/SpatialObjects/include/itkSpatialObject.hxx
+++ b/Modules/Core/SpatialObjects/include/itkSpatialObject.hxx
@@ -1305,9 +1305,7 @@ SpatialObject<TDimension>::GetClassNameAndDimension() const
 {
   std::ostringstream n;
 
-  n << GetNameOfClass();
-  n << "_";
-  n << TDimension;
+  n << GetNameOfClass() << "_" << TDimension;
 
   return n.str();
 }
diff --git a/Modules/Core/SpatialObjects/include/itkSurfaceSpatialObject.hxx b/Modules/Core/SpatialObjects/include/itkSurfaceSpatialObject.hxx
index 1dac77da7e1..5d925289229 100644
--- a/Modules/Core/SpatialObjects/include/itkSurfaceSpatialObject.hxx
+++ b/Modules/Core/SpatialObjects/include/itkSurfaceSpatialObject.hxx
@@ -196,9 +196,9 @@ SurfaceSpatialObject<TDimension, TSurfacePointType>::ComputeNormals()
 
       if ((identifier[0] == identifier[1]) || (identifier[1] == identifier[2]) || (identifier[0] == identifier[2]))
       {
-        std::cout << "Cannot find 3 distinct points!" << std::endl;
-        std::cout << identifier[0] << " : " << identifier[1] << " : " << identifier[2] << std::endl;
-        std::cout << max[0] << " : " << max[1] << " : " << max[2] << std::endl;
+        std::cout << "Cannot find 3 distinct points!" << std::endl
+                  << identifier[0] << " : " << identifier[1] << " : " << identifier[2] << std::endl
+                  << max[0] << " : " << max[1] << " : " << max[2] << std::endl;
         return false;
       }
 
@@ -250,9 +250,9 @@ SurfaceSpatialObject<TDimension, TSurfacePointType>::ComputeNormals()
 
     if (Math::AlmostEquals(absvec, 0.0))
     {
-      std::cout << "ComputeNormals Failed!" << std::endl;
-      std::cout << identifier[0] << " : " << identifier[1] << " : " << identifier[2] << std::endl;
-      std::cout << badId.size() << " : " << this->m_Points.size() - 1 << std::endl;
+      std::cout << "ComputeNormals Failed!" << std::endl
+                << identifier[0] << " : " << identifier[1] << " : " << identifier[2] << std::endl
+                << badId.size() << " : " << this->m_Points.size() - 1 << std::endl;
       return false;
     }
 
diff --git a/Modules/Core/SpatialObjects/include/itkTubeSpatialObject.hxx b/Modules/Core/SpatialObjects/include/itkTubeSpatialObject.hxx
index 8372768f706..190996e9b90 100644
--- a/Modules/Core/SpatialObjects/include/itkTubeSpatialObject.hxx
+++ b/Modules/Core/SpatialObjects/include/itkTubeSpatialObject.hxx
@@ -383,12 +383,12 @@ TubeSpatialObject<TDimension, TTubePointType>::ComputeTangentsAndNormals()
       //   RemoveDuplicatePointsInObjectSpace was not called.
       if (Math::AlmostEquals(l, 0.0) || std::isnan(l))
       {
-        std::cerr << "TubeSpatialObject::ComputeTangentAndNormals() : ";
-        std::cerr << "length between two consecutive points is 0";
-        std::cerr << " (use RemoveDuplicatePointsInObjectSpace())" << std::endl;
-        std::cerr << "   p1 = " << x1 << std::endl;
-        std::cerr << "   p2 = " << x2 << std::endl;
-        std::cerr << "   p3 = " << x3 << std::endl;
+        std::cerr << "TubeSpatialObject::ComputeTangentAndNormals() : "
+                  << "length between two consecutive points is 0"
+                  << " (use RemoveDuplicatePointsInObjectSpace())" << std::endl
+                  << "   p1 = " << x1 << std::endl
+                  << "   p2 = " << x2 << std::endl
+                  << "   p3 = " << x3 << std::endl;
         return false;
       }
     }
diff --git a/Modules/Core/Transform/include/itkTransform.hxx b/Modules/Core/Transform/include/itkTransform.hxx
index 77aadc732fb..3015bbbba99 100644
--- a/Modules/Core/Transform/include/itkTransform.hxx
+++ b/Modules/Core/Transform/include/itkTransform.hxx
@@ -38,10 +38,8 @@ Transform<TParametersValueType, VInputDimension, VOutputDimension>::GetTransform
 {
   std::ostringstream n;
 
-  n << GetNameOfClass();
-  n << "_";
-  n << this->GetTransformTypeAsString(static_cast<TParametersValueType *>(nullptr));
-  n << "_" << this->GetInputSpaceDimension() << "_" << this->GetOutputSpaceDimension();
+  n << GetNameOfClass() << "_" << this->GetTransformTypeAsString(static_cast<TParametersValueType *>(nullptr)) << "_"
+    << this->GetInputSpaceDimension() << "_" << this->GetOutputSpaceDimension();
   return n.str();
 }
 
diff --git a/Modules/Filtering/GPUAnisotropicSmoothing/include/itkGPUGradientNDAnisotropicDiffusionFunction.hxx b/Modules/Filtering/GPUAnisotropicSmoothing/include/itkGPUGradientNDAnisotropicDiffusionFunction.hxx
index c7810ad303a..27161a05cf6 100644
--- a/Modules/Filtering/GPUAnisotropicSmoothing/include/itkGPUGradientNDAnisotropicDiffusionFunction.hxx
+++ b/Modules/Filtering/GPUAnisotropicSmoothing/include/itkGPUGradientNDAnisotropicDiffusionFunction.hxx
@@ -83,8 +83,8 @@ GPUGradientNDAnisotropicDiffusionFunction<TImage>::GPUGradientNDAnisotropicDiffu
     itkExceptionMacro("GPUGradientNDAnisotropicDiffusionFunction supports 1/2/3D image.");
   }
 
-  defines << "#define DIM_" << TImage::ImageDimension << "\n";
-  defines << "#define BLOCK_SIZE " << OpenCLGetLocalBlockSize(TImage::ImageDimension) << "\n";
+  defines << "#define DIM_" << TImage::ImageDimension << "\n"
+          << "#define BLOCK_SIZE " << OpenCLGetLocalBlockSize(TImage::ImageDimension) << "\n";
 
   std::string pixeltypename = GetTypename(typeid(typename TImage::PixelType));
   defines << "#define PIXELTYPE " << pixeltypename << "\n";
diff --git a/Modules/Filtering/GPUImageFilterBase/include/itkGPUCastImageFilter.hxx b/Modules/Filtering/GPUImageFilterBase/include/itkGPUCastImageFilter.hxx
index ada31418b7a..de14a35521b 100644
--- a/Modules/Filtering/GPUImageFilterBase/include/itkGPUCastImageFilter.hxx
+++ b/Modules/Filtering/GPUImageFilterBase/include/itkGPUCastImageFilter.hxx
@@ -33,8 +33,8 @@ GPUCastImageFilter<TInputImage, TOutputImage>::GPUCastImageFilter()
     itkExceptionMacro("GPUCastImageFilter supports 1/2/3D image.");
   }
 
-  defines << "#define DIM_" << TInputImage::ImageDimension << "\n";
-  defines << "#define INPIXELTYPE ";
+  defines << "#define DIM_" << TInputImage::ImageDimension << "\n"
+          << "#define INPIXELTYPE ";
   GetTypenameInString(typeid(typename TInputImage::PixelType), defines);
   defines << "#define OUTPIXELTYPE ";
   GetTypenameInString(typeid(typename TOutputImage::PixelType), defines);
diff --git a/Modules/Filtering/GPUSmoothing/include/itkGPUMeanImageFilter.hxx b/Modules/Filtering/GPUSmoothing/include/itkGPUMeanImageFilter.hxx
index 421afe71bfb..041c8f66c66 100644
--- a/Modules/Filtering/GPUSmoothing/include/itkGPUMeanImageFilter.hxx
+++ b/Modules/Filtering/GPUSmoothing/include/itkGPUMeanImageFilter.hxx
@@ -32,8 +32,8 @@ GPUMeanImageFilter<TInputImage, TOutputImage>::GPUMeanImageFilter()
     itkExceptionMacro("GPUMeanImageFilter supports 1/2/3D image.");
   }
 
-  defines << "#define DIM_" << TInputImage::ImageDimension << "\n";
-  defines << "#define PIXELTYPE ";
+  defines << "#define DIM_" << TInputImage::ImageDimension << "\n"
+          << "#define PIXELTYPE ";
   GetTypenameInString(typeid(typename TInputImage::PixelType), defines);
 
   const char * GPUSource = GPUMeanImageFilter::GetOpenCLSource();
diff --git a/Modules/Filtering/GPUThresholding/include/itkGPUBinaryThresholdImageFilter.hxx b/Modules/Filtering/GPUThresholding/include/itkGPUBinaryThresholdImageFilter.hxx
index df26772963a..33bc17f570c 100644
--- a/Modules/Filtering/GPUThresholding/include/itkGPUBinaryThresholdImageFilter.hxx
+++ b/Modules/Filtering/GPUThresholding/include/itkGPUBinaryThresholdImageFilter.hxx
@@ -49,8 +49,8 @@ GPUBinaryThresholdImageFilter<TInputImage, TOutputImage>::GPUBinaryThresholdImag
   bool        isValid = GetValidTypename(typeid(typename TInputImage::PixelType), validTypes, validTypeName);
   if (isValid)
   {
-    defines << "#define InPixelType " << validTypeName << "\n";
-    defines << "#define OutPixelType " << validTypeName << "\n";
+    defines << "#define InPixelType " << validTypeName << "\n"
+            << "#define OutPixelType " << validTypeName << "\n";
 #ifdef __APPLE__
     // This is to work around a bug in the OpenCL compiler on Mac OS 10.6 and 10.7 with NVidia drivers
     // where the compiler was not handling unsigned char arguments correctly.
@@ -59,17 +59,17 @@ GPUBinaryThresholdImageFilter<TInputImage, TOutputImage>::GPUBinaryThresholdImag
     // is a known workaround to this problem.
     if (validTypeName == "unsigned char")
     {
-      defines << "#define InArgType unsigned short\n";
-      defines << "#define OutArgType unsigned short\n";
+      defines << "#define InArgType unsigned short\n"
+              << "#define OutArgType unsigned short\n";
     }
     else
     {
-      defines << "#define InArgType " << validTypeName << "\n";
-      defines << "#define OutArgType " << validTypeName << "\n";
+      defines << "#define InArgType " << validTypeName << "\n"
+              << "#define OutArgType " << validTypeName << "\n";
     }
 #else
-    defines << "#define InArgType " << validTypeName << "\n";
-    defines << "#define OutArgType " << validTypeName << "\n";
+    defines << "#define InArgType " << validTypeName << "\n"
+            << "#define OutArgType " << validTypeName << "\n";
 #endif
   }
   else
diff --git a/Modules/IO/CSV/include/itkCSVNumericObjectFileWriter.hxx b/Modules/IO/CSV/include/itkCSVNumericObjectFileWriter.hxx
index b69b648f66c..dd414aca70e 100644
--- a/Modules/IO/CSV/include/itkCSVNumericObjectFileWriter.hxx
+++ b/Modules/IO/CSV/include/itkCSVNumericObjectFileWriter.hxx
@@ -180,8 +180,7 @@ CSVNumericObjectFileWriter<TValue, VRows, VColumns>::Write()
   }
   catch (const itk::ExceptionObject & exp)
   {
-    std::cerr << "Exception caught! " << std::endl;
-    std::cerr << exp << std::endl;
+    std::cerr << "Exception caught! " << std::endl << exp << std::endl;
     outputStream.close();
     throw;
   }
diff --git a/Modules/IO/ImageBase/include/itkImageFileReader.hxx b/Modules/IO/ImageBase/include/itkImageFileReader.hxx
index 79b01dc7aa8..cf3d3c199f2 100644
--- a/Modules/IO/ImageBase/include/itkImageFileReader.hxx
+++ b/Modules/IO/ImageBase/include/itkImageFileReader.hxx
@@ -119,13 +119,13 @@ ImageFileReader<TOutputImage, ConvertPixelTraits>::GenerateOutputInformation()
           auto * io = dynamic_cast<ImageIOBase *>(allobject.GetPointer());
           msg << "    " << io->GetNameOfClass() << std::endl;
         }
-        msg << "  You probably failed to set a file suffix, or" << std::endl;
-        msg << "    set the suffix to an unsupported type." << std::endl;
+        msg << "  You probably failed to set a file suffix, or" << std::endl
+            << "    set the suffix to an unsupported type." << std::endl;
       }
       else
       {
-        msg << "  There are no registered IO factories." << std::endl;
-        msg << "  Please visit https://www.itk.org/Wiki/ITK/FAQ#NoFactoryException to diagnose the problem."
+        msg << "  There are no registered IO factories." << std::endl
+            << "  Please visit https://www.itk.org/Wiki/ITK/FAQ#NoFactoryException to diagnose the problem."
             << std::endl;
       }
     }
diff --git a/Modules/IO/ImageBase/include/itkImageFileWriter.hxx b/Modules/IO/ImageBase/include/itkImageFileWriter.hxx
index acd9253fc29..87911f77ef8 100644
--- a/Modules/IO/ImageBase/include/itkImageFileWriter.hxx
+++ b/Modules/IO/ImageBase/include/itkImageFileWriter.hxx
@@ -126,13 +126,13 @@ ImageFileWriter<TInputImage>::Write()
         auto * io = dynamic_cast<ImageIOBase *>(allobject.GetPointer());
         msg << "    " << io->GetNameOfClass() << std::endl;
       }
-      msg << "  You probably failed to set a file suffix, or" << std::endl;
-      msg << "    set the suffix to an unsupported type." << std::endl;
+      msg << "  You probably failed to set a file suffix, or" << std::endl
+          << "    set the suffix to an unsupported type." << std::endl;
     }
     else
     {
-      msg << "  There are no registered IO factories." << std::endl;
-      msg << "  Please visit https://www.itk.org/Wiki/ITK/FAQ#NoFactoryException to diagnose the problem." << std::endl;
+      msg << "  There are no registered IO factories." << std::endl
+          << "  Please visit https://www.itk.org/Wiki/ITK/FAQ#NoFactoryException to diagnose the problem." << std::endl;
     }
     e.SetDescription(msg.str().c_str());
     e.SetLocation(ITK_LOCATION);
@@ -365,11 +365,10 @@ ImageFileWriter<TInputImage>::GenerateData()
     {
       ImageFileWriterException e(__FILE__, __LINE__);
       std::ostringstream       msg;
-      msg << "Did not get requested region!" << std::endl;
-      msg << "Requested:" << std::endl;
-      msg << ioRegion;
-      msg << "Actual:" << std::endl;
-      msg << bufferedRegion;
+      msg << "Did not get requested region!" << std::endl
+          << "Requested:" << std::endl
+          << ioRegion << "Actual:" << std::endl
+          << bufferedRegion;
       e.SetDescription(msg.str().c_str());
       e.SetLocation(ITK_LOCATION);
       throw e;
diff --git a/Modules/IO/JPEG2000/src/itkJPEG2000ImageIO.cxx b/Modules/IO/JPEG2000/src/itkJPEG2000ImageIO.cxx
index 699719bc90a..4475a396308 100644
--- a/Modules/IO/JPEG2000/src/itkJPEG2000ImageIO.cxx
+++ b/Modules/IO/JPEG2000/src/itkJPEG2000ImageIO.cxx
@@ -780,8 +780,8 @@ JPEG2000ImageIO::Write(const void * buffer)
     {
       // TODO should this be and excpetion? can we continue loading
       // and expect good results
-      std::cerr << "Unrecognized progression order in option -P (POC n " << i + 1;
-      std::cerr << ") [LRCP, RLCP, RPCL, PCRL, CPRL] !!" << std::endl;
+      std::cerr << "Unrecognized progression order in option -P (POC n " << i + 1
+                << ") [LRCP, RLCP, RPCL, PCRL, CPRL] !!" << std::endl;
     }
   }
 
diff --git a/Modules/IO/MeshBYU/src/itkBYUMeshIO.cxx b/Modules/IO/MeshBYU/src/itkBYUMeshIO.cxx
index f4f8e74ac8f..46e2e5a9b61 100644
--- a/Modules/IO/MeshBYU/src/itkBYUMeshIO.cxx
+++ b/Modules/IO/MeshBYU/src/itkBYUMeshIO.cxx
@@ -298,12 +298,9 @@ BYUMeshIO::WriteMeshInformation()
 
   // Write BYU file header
   Indent indent(7);
-  outputFile << indent << 1;
-  outputFile << indent << this->m_NumberOfPoints;
-  outputFile << indent << this->m_NumberOfCells;
-  outputFile << indent << this->m_CellBufferSize - 2 * this->m_NumberOfCells << std::endl;
-  outputFile << indent << 1;
-  outputFile << indent << this->m_NumberOfCells << std::endl;
+  outputFile << indent << 1 << indent << this->m_NumberOfPoints << indent << this->m_NumberOfCells << indent
+             << this->m_CellBufferSize - 2 * this->m_NumberOfCells << std::endl
+             << indent << 1 << indent << this->m_NumberOfCells << std::endl;
 
   outputFile.close();
 }
diff --git a/Modules/IO/MeshBase/include/itkMeshFileReader.hxx b/Modules/IO/MeshBase/include/itkMeshFileReader.hxx
index 5fc54284b19..d73a956381d 100644
--- a/Modules/IO/MeshBase/include/itkMeshFileReader.hxx
+++ b/Modules/IO/MeshBase/include/itkMeshFileReader.hxx
@@ -463,8 +463,8 @@ MeshFileReader<TOutputMesh, ConvertPointPixelTraits, ConvertCellPixelTraits>::Ge
         auto * io = dynamic_cast<MeshIOBase *>(allobject.GetPointer());
         msg << "    " << io->GetNameOfClass() << std::endl;
       }
-      msg << "  You probably failed to set a file suffix, or" << std::endl;
-      msg << "  set the suffix to an unsupported type." << std::endl;
+      msg << "  You probably failed to set a file suffix, or" << std::endl
+          << "  set the suffix to an unsupported type." << std::endl;
     }
 
     MeshFileReaderException e(__FILE__, __LINE__, msg.str().c_str(), ITK_LOCATION);
diff --git a/Modules/IO/MeshBase/include/itkMeshFileWriter.hxx b/Modules/IO/MeshBase/include/itkMeshFileWriter.hxx
index 21949d43f2c..108e599c0cd 100644
--- a/Modules/IO/MeshBase/include/itkMeshFileWriter.hxx
+++ b/Modules/IO/MeshBase/include/itkMeshFileWriter.hxx
@@ -111,8 +111,8 @@ MeshFileWriter<TInputMesh>::Write()
   {
     MeshFileWriterException e(__FILE__, __LINE__);
     std::ostringstream      msg;
-    msg << " Could not create IO object for file " << m_FileName.c_str() << std::endl;
-    msg << "  Tried to create one of the following:" << std::endl;
+    msg << " Could not create IO object for file " << m_FileName.c_str() << std::endl
+        << "  Tried to create one of the following:" << std::endl;
     {
       for (auto & allobject : ObjectFactoryBase::CreateAllInstance("itkMeshIOBase"))
       {
@@ -121,8 +121,8 @@ MeshFileWriter<TInputMesh>::Write()
       }
     }
 
-    msg << "  You probably failed to set a file suffix, or" << std::endl;
-    msg << "    set the suffix to an unsupported type." << std::endl;
+    msg << "  You probably failed to set a file suffix, or" << std::endl
+        << "    set the suffix to an unsupported type." << std::endl;
     e.SetDescription(msg.str().c_str());
     e.SetLocation(ITK_LOCATION);
     throw e;
diff --git a/Modules/IO/MeshOBJ/src/itkOBJMeshIO.cxx b/Modules/IO/MeshOBJ/src/itkOBJMeshIO.cxx
index 1464cb52f5e..76956f25704 100644
--- a/Modules/IO/MeshOBJ/src/itkOBJMeshIO.cxx
+++ b/Modules/IO/MeshOBJ/src/itkOBJMeshIO.cxx
@@ -363,8 +363,8 @@ OBJMeshIO::WriteMeshInformation()
   outputFile << "# OBJ file generated by ITK\n";
 
   // Write the number of points and number of cells
-  outputFile << "#  Number of points " << this->m_NumberOfPoints << "\n";
-  outputFile << "#  Number of cells " << this->m_NumberOfCells << "\n";
+  outputFile << "#  Number of points " << this->m_NumberOfPoints << "\n"
+             << "#  Number of cells " << this->m_NumberOfCells << "\n";
   outputFile.close();
 }
 
diff --git a/Modules/IO/MeshVTK/include/itkVTKPolyDataMeshIO.h b/Modules/IO/MeshVTK/include/itkVTKPolyDataMeshIO.h
index 93c7cd3a53e..2579eafb3f4 100644
--- a/Modules/IO/MeshVTK/include/itkVTKPolyDataMeshIO.h
+++ b/Modules/IO/MeshVTK/include/itkVTKPolyDataMeshIO.h
@@ -449,8 +449,7 @@ class ITKIOMeshVTK_EXPORT VTKPolyDataMeshIO : public MeshIOBase
   WritePointsBufferAsBINARY(std::ofstream & outputFile, T * buffer, const StringType & pointComponentType)
   {
     /** 1. Write number of points */
-    outputFile << "POINTS " << this->m_NumberOfPoints;
-    outputFile << pointComponentType << "\n";
+    outputFile << "POINTS " << this->m_NumberOfPoints << pointComponentType << "\n";
     itk::ByteSwapper<T>::SwapWriteRangeFromSystemToBigEndian(
       buffer, this->m_NumberOfPoints * this->m_PointDimension, &outputFile);
     outputFile << "\n";
@@ -748,12 +747,10 @@ class ITKIOMeshVTK_EXPORT VTKPolyDataMeshIO : public MeshIOBase
           // row 1
           outputFile << ConvertNumberToString(*ptr++) << indent;
           e12 = *ptr++;
-          outputFile << ConvertNumberToString(e12) << indent;
-          outputFile << ConvertNumberToString(zero) << '\n';
+          outputFile << ConvertNumberToString(e12) << indent << ConvertNumberToString(zero) << '\n';
           // row 2
-          outputFile << ConvertNumberToString(e12) << indent;
-          outputFile << ConvertNumberToString(*ptr++) << indent;
-          outputFile << ConvertNumberToString(zero) << '\n';
+          outputFile << ConvertNumberToString(e12) << indent << ConvertNumberToString(*ptr++) << indent
+                     << ConvertNumberToString(zero) << '\n';
           // row 3
           outputFile << ConvertNumberToString(zero) << indent << ConvertNumberToString(zero) << indent
                      << ConvertNumberToString(zero) << "\n\n";
@@ -774,14 +771,12 @@ class ITKIOMeshVTK_EXPORT VTKPolyDataMeshIO : public MeshIOBase
           e13 = *ptr++;
           outputFile << ConvertNumberToString(e13) << '\n';
           // row 2
-          outputFile << ConvertNumberToString(e12) << indent;
-          outputFile << ConvertNumberToString(*ptr++) << indent;
+          outputFile << ConvertNumberToString(e12) << indent << ConvertNumberToString(*ptr++) << indent;
           e23 = *ptr++;
           outputFile << ConvertNumberToString(e23) << '\n';
           // row 3
-          outputFile << ConvertNumberToString(e13) << indent;
-          outputFile << ConvertNumberToString(e23) << indent;
-          outputFile << ConvertNumberToString(*ptr++) << "\n\n";
+          outputFile << ConvertNumberToString(e13) << indent << ConvertNumberToString(e23) << indent
+                     << ConvertNumberToString(*ptr++) << "\n\n";
           i += 6;
         }
       }
@@ -801,8 +796,7 @@ class ITKIOMeshVTK_EXPORT VTKPolyDataMeshIO : public MeshIOBase
         {
           outputFile << ConvertNumberToString(buffer[ii * this->m_NumberOfPointPixelComponents + jj]) << indent;
         }
-        outputFile << ConvertNumberToString(buffer[ii * this->m_NumberOfPointPixelComponents + jj]);
-        outputFile << '\n';
+        outputFile << ConvertNumberToString(buffer[ii * this->m_NumberOfPointPixelComponents + jj]) << '\n';
       }
     }
 
@@ -944,12 +938,9 @@ class ITKIOMeshVTK_EXPORT VTKPolyDataMeshIO : public MeshIOBase
           // row 1
           outputFile << *ptr++ << indent;
           e12 = *ptr++;
-          outputFile << e12 << indent;
-          outputFile << zero << '\n';
+          outputFile << e12 << indent << zero << '\n';
           // row 2
-          outputFile << e12 << indent;
-          outputFile << *ptr++ << indent;
-          outputFile << zero << '\n';
+          outputFile << e12 << indent << *ptr++ << indent << zero << '\n';
           // row 3
           outputFile << zero << indent << zero << indent << zero << "\n\n";
           i += 3;
@@ -969,14 +960,11 @@ class ITKIOMeshVTK_EXPORT VTKPolyDataMeshIO : public MeshIOBase
           e13 = *ptr++;
           outputFile << e13 << '\n';
           // row 2
-          outputFile << e12 << indent;
-          outputFile << *ptr++ << indent;
+          outputFile << e12 << indent << *ptr++ << indent;
           e23 = *ptr++;
           outputFile << e23 << '\n';
           // row 3
-          outputFile << e13 << indent;
-          outputFile << e23 << indent;
-          outputFile << *ptr++ << "\n\n";
+          outputFile << e13 << indent << e23 << indent << *ptr++ << "\n\n";
           i += 6;
         }
       }
@@ -998,8 +986,7 @@ class ITKIOMeshVTK_EXPORT VTKPolyDataMeshIO : public MeshIOBase
         {
           outputFile << buffer[ii * this->m_NumberOfCellPixelComponents + jj] << indent;
         }
-        outputFile << buffer[ii * this->m_NumberOfCellPixelComponents + jj];
-        outputFile << '\n';
+        outputFile << buffer[ii * this->m_NumberOfCellPixelComponents + jj] << '\n';
       }
     }
 
diff --git a/Modules/IO/PhilipsREC/src/itkPhilipsRECImageIO.cxx b/Modules/IO/PhilipsREC/src/itkPhilipsRECImageIO.cxx
index b365a740353..e3d29acb2e3 100644
--- a/Modules/IO/PhilipsREC/src/itkPhilipsRECImageIO.cxx
+++ b/Modules/IO/PhilipsREC/src/itkPhilipsRECImageIO.cxx
@@ -761,8 +761,7 @@ PhilipsRECImageIO::ReadImageInformation()
   }
 //#define DEBUG_ORIENTATION
 #ifdef DEBUG_ORIENTATION
-  std::cout << "Direction cosines = " << direction << std::endl;
-  std::cout << "Spacing = " << spacing << std::endl;
+  std::cout << "Direction cosines = " << direction << std::endl << "Spacing = " << spacing << std::endl;
 #endif
   // Create right/left rotation matrix (about x axis).
   AffineMatrix r1;
@@ -788,10 +787,10 @@ PhilipsRECImageIO::ReadImageInformation()
   // Total rotation matrix.
   AffineMatrix rtotal = r1 * r2 * r3;
 #ifdef DEBUG_ORIENTATION
-  std::cout << "Right-Left rotation = " << r1 << std::endl;
-  std::cout << "Anterior-Posterior rotation = " << r2 << std::endl;
-  std::cout << "Foot-Head rotation = " << r3 << std::endl;
-  std::cout << "Total = " << rtotal << std::endl;
+  std::cout << "Right-Left rotation = " << r1 << std::endl
+            << "Anterior-Posterior rotation = " << r2 << std::endl
+            << "Foot-Head rotation = " << r3 << std::endl
+            << "Total = " << rtotal << std::endl;
 #endif
 
   // Find and set origin
diff --git a/Modules/IO/TransformBase/src/itkTransformFileReader.cxx b/Modules/IO/TransformBase/src/itkTransformFileReader.cxx
index 8ac26d02bdf..6decc7bb76a 100644
--- a/Modules/IO/TransformBase/src/itkTransformFileReader.cxx
+++ b/Modules/IO/TransformBase/src/itkTransformFileReader.cxx
@@ -115,13 +115,13 @@ TransformFileReaderTemplate<TParametersValueType>::Update()
           const Object * obj = dynamic_cast<Object *>(allobject.GetPointer());
           msg << "    " << obj->GetNameOfClass() << std::endl;
         }
-        msg << "  You probably failed to set a file suffix, or" << std::endl;
-        msg << "    set the suffix to an unsupported type." << std::endl;
+        msg << "  You probably failed to set a file suffix, or" << std::endl
+            << "    set the suffix to an unsupported type." << std::endl;
       }
       else
       {
-        msg << "  There are no registered Transform IO factories." << std::endl;
-        msg << "  Please visit https://www.itk.org/Wiki/ITK/FAQ#NoFactoryException to diagnose the problem."
+        msg << "  There are no registered Transform IO factories." << std::endl
+            << "  Please visit https://www.itk.org/Wiki/ITK/FAQ#NoFactoryException to diagnose the problem."
             << std::endl;
       }
 
diff --git a/Modules/IO/TransformBase/src/itkTransformFileWriterSpecializations.cxx b/Modules/IO/TransformBase/src/itkTransformFileWriterSpecializations.cxx
index 7e21604cea3..7d6f3490de9 100644
--- a/Modules/IO/TransformBase/src/itkTransformFileWriterSpecializations.cxx
+++ b/Modules/IO/TransformBase/src/itkTransformFileWriterSpecializations.cxx
@@ -146,13 +146,13 @@ TransformFileWriterTemplate<TParametersValueType>::Update()
           const Object * obj = dynamic_cast<Object *>(allobject.GetPointer());
           msg << "    " << obj->GetNameOfClass() << std::endl;
         }
-        msg << "  You probably failed to set a file suffix, or" << std::endl;
-        msg << "    set the suffix to an unsupported type." << std::endl;
+        msg << "  You probably failed to set a file suffix, or" << std::endl
+            << "    set the suffix to an unsupported type." << std::endl;
       }
       else
       {
-        msg << "  There are no registered Transform IO factories." << std::endl;
-        msg << "  Please visit https://www.itk.org/Wiki/ITK/FAQ#NoFactoryException to diagnose the problem."
+        msg << "  There are no registered Transform IO factories." << std::endl
+            << "  Please visit https://www.itk.org/Wiki/ITK/FAQ#NoFactoryException to diagnose the problem."
             << std::endl;
       }
 
diff --git a/Modules/IO/TransformHDF5/src/itkHDF5TransformIO.cxx b/Modules/IO/TransformHDF5/src/itkHDF5TransformIO.cxx
index 3afeb22b29a..76df9f1c461 100644
--- a/Modules/IO/TransformHDF5/src/itkHDF5TransformIO.cxx
+++ b/Modules/IO/TransformHDF5/src/itkHDF5TransformIO.cxx
@@ -494,9 +494,7 @@ const std::string
 GetTransformName(int i)
 {
   std::stringstream s;
-  s << HDF5CommonPathNames::transformGroupName;
-  s << "/";
-  s << i;
+  s << HDF5CommonPathNames::transformGroupName << "/" << i;
   return s.str();
 }
 
diff --git a/Modules/IO/TransformInsightLegacy/src/itkTxtTransformIO.cxx b/Modules/IO/TransformInsightLegacy/src/itkTxtTransformIO.cxx
index 5eaf8b92db5..bff0247bcfc 100644
--- a/Modules/IO/TransformInsightLegacy/src/itkTxtTransformIO.cxx
+++ b/Modules/IO/TransformInsightLegacy/src/itkTxtTransformIO.cxx
@@ -280,8 +280,7 @@ TxtTransformIOTemplate<TParametersValueType>::Write()
   for (typename ConstTransformListType::const_iterator it = transformList.begin(); it != end; ++it, ++count)
   {
     const std::string TransformTypeName = (*it)->GetTransformTypeAsString();
-    out << "#Transform " << count << std::endl;
-    out << "Transform: " << (*it)->GetTransformTypeAsString() << std::endl;
+    out << "#Transform " << count << std::endl << "Transform: " << (*it)->GetTransformTypeAsString() << std::endl;
     //
     // Composite Transforms are not written out with parameters;
     // their parameters are the union of all their component
diff --git a/Modules/IO/VTK/src/itkVTKImageIO.cxx b/Modules/IO/VTK/src/itkVTKImageIO.cxx
index eb47e52091d..1d1e1e9e60b 100644
--- a/Modules/IO/VTK/src/itkVTKImageIO.cxx
+++ b/Modules/IO/VTK/src/itkVTKImageIO.cxx
@@ -646,8 +646,8 @@ VTKImageIO::WriteImageInformation(const void * itkNotUsed(buffer))
   }
 
   // Write the VTK header information
-  file << "# vtk DataFile Version 3.0\n";
-  file << "VTK File Generated by Insight Segmentation and Registration Toolkit (ITK)\n";
+  file << "# vtk DataFile Version 3.0\n"
+       << "VTK File Generated by Insight Segmentation and Registration Toolkit (ITK)\n";
 
   if (this->GetFileType() == IOFileEnum::ASCII)
   {
@@ -665,8 +665,8 @@ VTKImageIO::WriteImageInformation(const void * itkNotUsed(buffer))
   file.flush();
 
   // Write characteristics of the data
-  file << "DATASET STRUCTURED_POINTS\n";
-  file << "DIMENSIONS " << this->GetDimensions(0) << " "
+  file << "DATASET STRUCTURED_POINTS\n"
+       << "DIMENSIONS " << this->GetDimensions(0) << " "
        << ((this->GetNumberOfDimensions() > 1) ? this->GetDimensions(1) : 1) << " "
        << ((this->GetNumberOfDimensions() > 2) ? this->GetDimensions(2) : 1) << " "
        << "\n";
diff --git a/Modules/Nonunit/Review/src/itkVoxBoCUBImageIO.cxx b/Modules/Nonunit/Review/src/itkVoxBoCUBImageIO.cxx
index 315af4bede5..3bf46863e57 100644
--- a/Modules/Nonunit/Review/src/itkVoxBoCUBImageIO.cxx
+++ b/Modules/Nonunit/Review/src/itkVoxBoCUBImageIO.cxx
@@ -643,8 +643,7 @@ VoxBoCUBImageIO::WriteImageInformation()
   std::ostringstream header;
 
   // Write the identifiers
-  header << m_VB_IDENTIFIER_SYSTEM << std::endl;
-  header << m_VB_IDENTIFIER_FILETYPE << std::endl;
+  header << m_VB_IDENTIFIER_SYSTEM << std::endl << m_VB_IDENTIFIER_FILETYPE << std::endl;
 
   // Write the data type
   switch (m_ComponentType)
diff --git a/Modules/Numerics/FEM/include/itkFEMImageMetricLoad.hxx b/Modules/Numerics/FEM/include/itkFEMImageMetricLoad.hxx
index 85c1ea39836..1cb2114714d 100644
--- a/Modules/Numerics/FEM/include/itkFEMImageMetricLoad.hxx
+++ b/Modules/Numerics/FEM/include/itkFEMImageMetricLoad.hxx
@@ -119,8 +119,7 @@ ImageMetricLoad<TMoving, TFixed>::InitializeMetric()
   }
   catch (const ExceptionObject & e)
   {
-    std::cout << "Metric initialization failed" << std::endl;
-    std::cout << "Reason " << e.GetDescription() << std::endl;
+    std::cout << "Metric initialization failed" << std::endl << "Reason " << e.GetDescription() << std::endl;
   }
 }
 
diff --git a/Modules/Numerics/Optimizers/src/itkExhaustiveOptimizer.cxx b/Modules/Numerics/Optimizers/src/itkExhaustiveOptimizer.cxx
index 189a1eb21a4..51e806bcede 100644
--- a/Modules/Numerics/Optimizers/src/itkExhaustiveOptimizer.cxx
+++ b/Modules/Numerics/Optimizers/src/itkExhaustiveOptimizer.cxx
@@ -123,8 +123,8 @@ ExhaustiveOptimizer::ResumeWalking()
     }
 
     m_StopConditionDescription.str("");
-    m_StopConditionDescription << this->GetNameOfClass() << ": Running. ";
-    m_StopConditionDescription << "@ index " << this->GetCurrentIndex() << " value is " << this->GetCurrentValue();
+    m_StopConditionDescription << this->GetNameOfClass() << ": Running. "
+                               << "@ index " << this->GetCurrentIndex() << " value is " << this->GetCurrentValue();
 
     this->InvokeEvent(IterationEvent());
     this->AdvanceOneStep();
@@ -181,8 +181,8 @@ ExhaustiveOptimizer::IncrementIndex(ParametersType & newPosition)
   {
     m_Stop = true;
     m_StopConditionDescription.str("");
-    m_StopConditionDescription << this->GetNameOfClass() << ": ";
-    m_StopConditionDescription << "Completed sampling of parametric space of size " << spaceDimension;
+    m_StopConditionDescription << this->GetNameOfClass() << ": "
+                               << "Completed sampling of parametric space of size " << spaceDimension;
   }
 
   const ScalesType & scales = this->GetScales();
diff --git a/Modules/Numerics/Optimizers/src/itkOnePlusOneEvolutionaryOptimizer.cxx b/Modules/Numerics/Optimizers/src/itkOnePlusOneEvolutionaryOptimizer.cxx
index d82bfb810ff..867ca4b45ca 100644
--- a/Modules/Numerics/Optimizers/src/itkOnePlusOneEvolutionaryOptimizer.cxx
+++ b/Modules/Numerics/Optimizers/src/itkOnePlusOneEvolutionaryOptimizer.cxx
@@ -143,8 +143,8 @@ OnePlusOneEvolutionaryOptimizer::StartOptimization()
     if (m_Stop)
     {
       m_StopConditionDescription.str("");
-      m_StopConditionDescription << this->GetNameOfClass() << ": ";
-      m_StopConditionDescription << "StopOptimization() called";
+      m_StopConditionDescription << this->GetNameOfClass() << ": "
+                                 << "StopOptimization() called";
       break;
     }
 
@@ -242,8 +242,8 @@ OnePlusOneEvolutionaryOptimizer::StartOptimization()
     {
       itkDebugMacro(<< "converges at iteration = " << iter);
       m_StopConditionDescription.str("");
-      m_StopConditionDescription << this->GetNameOfClass() << ": ";
-      m_StopConditionDescription << "Fnorm (" << m_FrobeniusNorm << ") is less than Epsilon (" << m_Epsilon
+      m_StopConditionDescription << this->GetNameOfClass() << ": "
+                                 << "Fnorm (" << m_FrobeniusNorm << ") is less than Epsilon (" << m_Epsilon
                                  << " at iteration #" << iter;
       this->InvokeEvent(EndEvent());
       return;
@@ -275,8 +275,8 @@ OnePlusOneEvolutionaryOptimizer::StartOptimization()
     itkDebugMacro(<< "Current position: " << this->GetCurrentPosition());
   }
   m_StopConditionDescription.str("");
-  m_StopConditionDescription << this->GetNameOfClass() << ": ";
-  m_StopConditionDescription << "Maximum number of iterations (" << m_MaximumIteration << ") exceeded. ";
+  m_StopConditionDescription << this->GetNameOfClass() << ": "
+                             << "Maximum number of iterations (" << m_MaximumIteration << ") exceeded. ";
   this->InvokeEvent(EndEvent());
 }
 
diff --git a/Modules/Numerics/Optimizersv4/include/itkCommandIterationUpdatev4.h b/Modules/Numerics/Optimizersv4/include/itkCommandIterationUpdatev4.h
index 849b8929f51..99130d6b099 100644
--- a/Modules/Numerics/Optimizersv4/include/itkCommandIterationUpdatev4.h
+++ b/Modules/Numerics/Optimizersv4/include/itkCommandIterationUpdatev4.h
@@ -69,13 +69,11 @@ class CommandIterationUpdatev4 : public Command
   {
     if (typeid(event) == typeid(itk::StartEvent))
     {
-      std::cout << std::endl << "Position              Value";
-      std::cout << std::endl << std::endl;
+      std::cout << std::endl << "Position              Value" << std::endl << std::endl;
     }
     else if (typeid(event) == typeid(itk::IterationEvent))
     {
-      std::cout << m_Optimizer->GetCurrentIteration() << " = ";
-      std::cout << m_Optimizer->GetValue();
+      std::cout << m_Optimizer->GetCurrentIteration() << " = " << m_Optimizer->GetValue();
       if (m_PrintParameters)
       {
         std::cout << " : " << m_Optimizer->GetCurrentPosition();
@@ -84,18 +82,15 @@ class CommandIterationUpdatev4 : public Command
     }
     else if (typeid(event) == typeid(itk::EndEvent))
     {
-      std::cout << std::endl << std::endl;
-      std::cout << "After " << m_Optimizer->GetCurrentIteration();
-      std::cout << "  iterations " << std::endl;
+      std::cout << std::endl
+                << std::endl
+                << "After " << m_Optimizer->GetCurrentIteration() << "  iterations " << std::endl;
       if (m_PrintParameters)
       {
-        std::cout << " Solution is    = " << m_Optimizer->GetCurrentPosition();
-        std::cout << std::endl;
+        std::cout << " Solution is    = " << m_Optimizer->GetCurrentPosition() << std::endl;
       }
-      std::cout << "Solution value     = " << m_Optimizer->GetValue();
-      std::cout << std::endl;
-      std::cout << "Stop condition = " << m_Optimizer->GetStopConditionDescription();
-      std::cout << std::endl;
+      std::cout << "Solution value     = " << m_Optimizer->GetValue() << std::endl
+                << "Stop condition = " << m_Optimizer->GetStopConditionDescription() << std::endl;
     }
   }
 
diff --git a/Modules/Numerics/Optimizersv4/include/itkExhaustiveOptimizerv4.hxx b/Modules/Numerics/Optimizersv4/include/itkExhaustiveOptimizerv4.hxx
index 932036a6eec..36ef4990085 100644
--- a/Modules/Numerics/Optimizersv4/include/itkExhaustiveOptimizerv4.hxx
+++ b/Modules/Numerics/Optimizersv4/include/itkExhaustiveOptimizerv4.hxx
@@ -129,8 +129,8 @@ ExhaustiveOptimizerv4<TInternalComputationValueType>::ResumeWalking()
     }
 
     m_StopConditionDescription.str("");
-    m_StopConditionDescription << this->GetNameOfClass() << ": Running. ";
-    m_StopConditionDescription << "@ index " << this->GetCurrentIndex() << " value is " << m_CurrentValue;
+    m_StopConditionDescription << this->GetNameOfClass() << ": Running. "
+                               << "@ index " << this->GetCurrentIndex() << " value is " << m_CurrentValue;
 
     this->InvokeEvent(IterationEvent());
     this->AdvanceOneStep();
@@ -190,8 +190,8 @@ ExhaustiveOptimizerv4<TInternalComputationValueType>::IncrementIndex(ParametersT
   {
     m_Stop = true;
     m_StopConditionDescription.str("");
-    m_StopConditionDescription << this->GetNameOfClass() << ": ";
-    m_StopConditionDescription << "Completed sampling of parametric space of size " << spaceDimension;
+    m_StopConditionDescription << this->GetNameOfClass() << ": "
+                               << "Completed sampling of parametric space of size " << spaceDimension;
   }
 
   const ScalesType & scales = this->GetScales();
diff --git a/Modules/Numerics/Optimizersv4/include/itkOnePlusOneEvolutionaryOptimizerv4.hxx b/Modules/Numerics/Optimizersv4/include/itkOnePlusOneEvolutionaryOptimizerv4.hxx
index c03a8017f03..d70c69f48ed 100644
--- a/Modules/Numerics/Optimizersv4/include/itkOnePlusOneEvolutionaryOptimizerv4.hxx
+++ b/Modules/Numerics/Optimizersv4/include/itkOnePlusOneEvolutionaryOptimizerv4.hxx
@@ -151,8 +151,8 @@ OnePlusOneEvolutionaryOptimizerv4<TInternalComputationValueType>::StartOptimizat
     if (m_Stop)
     {
       m_StopConditionDescription.str("");
-      m_StopConditionDescription << this->GetNameOfClass() << ": ";
-      m_StopConditionDescription << "StopOptimization() called";
+      m_StopConditionDescription << this->GetNameOfClass() << ": "
+                                 << "StopOptimization() called";
       break;
     }
 
@@ -232,8 +232,8 @@ OnePlusOneEvolutionaryOptimizerv4<TInternalComputationValueType>::StartOptimizat
     {
       itkDebugMacro(<< "converges at iteration = " << this->m_CurrentIteration);
       m_StopConditionDescription.str("");
-      m_StopConditionDescription << this->GetNameOfClass() << ": ";
-      m_StopConditionDescription << "Fnorm (" << m_FrobeniusNorm << ") is less than Epsilon (" << m_Epsilon
+      m_StopConditionDescription << this->GetNameOfClass() << ": "
+                                 << "Fnorm (" << m_FrobeniusNorm << ") is less than Epsilon (" << m_Epsilon
                                  << " at iteration #" << this->m_CurrentIteration;
       this->InvokeEvent(EndEvent());
       return;
@@ -267,8 +267,8 @@ OnePlusOneEvolutionaryOptimizerv4<TInternalComputationValueType>::StartOptimizat
   if (this->m_CurrentIteration >= m_MaximumIteration)
   {
     m_StopConditionDescription.str("");
-    m_StopConditionDescription << this->GetNameOfClass() << ": ";
-    m_StopConditionDescription << "Maximum number of iterations (" << m_MaximumIteration << ") exceeded. ";
+    m_StopConditionDescription << this->GetNameOfClass() << ": "
+                               << "Maximum number of iterations (" << m_MaximumIteration << ") exceeded. ";
   }
   this->InvokeEvent(EndEvent());
 }
diff --git a/Modules/Registration/Common/include/itkCommandIterationUpdate.h b/Modules/Registration/Common/include/itkCommandIterationUpdate.h
index 621a1c2ce31..92214433def 100644
--- a/Modules/Registration/Common/include/itkCommandIterationUpdate.h
+++ b/Modules/Registration/Common/include/itkCommandIterationUpdate.h
@@ -69,26 +69,21 @@ class CommandIterationUpdate : public Command
   {
     if (typeid(event) == typeid(itk::StartEvent))
     {
-      std::cout << std::endl << "Position              Value";
-      std::cout << std::endl << std::endl;
+      std::cout << std::endl << "Position              Value" << std::endl << std::endl;
     }
     else if (typeid(event) == typeid(itk::IterationEvent))
     {
-      std::cout << m_Optimizer->GetCurrentIteration() << " = ";
-      std::cout << m_Optimizer->GetValue() << " : ";
-      std::cout << m_Optimizer->GetCurrentPosition() << std::endl;
+      std::cout << m_Optimizer->GetCurrentIteration() << " = " << m_Optimizer->GetValue() << " : "
+                << m_Optimizer->GetCurrentPosition() << std::endl;
     }
     else if (typeid(event) == typeid(itk::EndEvent))
     {
-      std::cout << std::endl << std::endl;
-      std::cout << "After " << m_Optimizer->GetCurrentIteration();
-      std::cout << "  iterations " << std::endl;
-      std::cout << "Solution is    = " << m_Optimizer->GetCurrentPosition();
-      std::cout << std::endl;
-      std::cout << "With value     = " << m_Optimizer->GetValue();
-      std::cout << std::endl;
-      std::cout << "Stop condition = " << m_Optimizer->GetStopCondition();
-      std::cout << std::endl;
+      std::cout << std::endl
+                << std::endl
+                << "After " << m_Optimizer->GetCurrentIteration() << "  iterations " << std::endl
+                << "Solution is    = " << m_Optimizer->GetCurrentPosition() << std::endl
+                << "With value     = " << m_Optimizer->GetValue() << std::endl
+                << "Stop condition = " << m_Optimizer->GetStopCondition() << std::endl;
     }
   }
 
diff --git a/Modules/Registration/Common/include/itkCommandVnlIterationUpdate.h b/Modules/Registration/Common/include/itkCommandVnlIterationUpdate.h
index d22a0db273d..22826333a90 100644
--- a/Modules/Registration/Common/include/itkCommandVnlIterationUpdate.h
+++ b/Modules/Registration/Common/include/itkCommandVnlIterationUpdate.h
@@ -69,22 +69,19 @@ class CommandVnlIterationUpdate : public Command
   {
     if (typeid(event) == typeid(itk::StartEvent))
     {
-      std::cout << std::endl << "Position              Value";
-      std::cout << std::endl << std::endl;
+      std::cout << std::endl << "Position              Value" << std::endl << std::endl;
     }
     else if (itk::IterationEvent().CheckEvent(&event))
     {
-      std::cout << m_Optimizer->GetCurrentIteration() << " = ";
-      std::cout << m_Optimizer->GetCurrentPosition() << std::endl;
+      std::cout << m_Optimizer->GetCurrentIteration() << " = " << m_Optimizer->GetCurrentPosition() << std::endl;
     }
     else if (typeid(event) == typeid(itk::EndEvent))
     {
-      std::cout << std::endl << std::endl;
-      std::cout << "After " << m_Optimizer->GetCurrentIteration();
-      std::cout << "  iterations " << std::endl;
-      std::cout << "Solution is    = " << m_Optimizer->GetCurrentPosition();
-      std::cout << std::endl;
-      std::cout << "vnl report = " << std::endl;
+      std::cout << std::endl
+                << std::endl
+                << "After " << m_Optimizer->GetCurrentIteration() << "  iterations " << std::endl
+                << "Solution is    = " << m_Optimizer->GetCurrentPosition() << std::endl
+                << "vnl report = " << std::endl;
       m_Optimizer->GetOptimizer()->diagnose_outcome(std::cout);
     }
   }
diff --git a/Modules/Segmentation/KLMRegionGrowing/src/itkKLMSegmentationBorder.cxx b/Modules/Segmentation/KLMRegionGrowing/src/itkKLMSegmentationBorder.cxx
index d39d9261af2..1cac79e46da 100644
--- a/Modules/Segmentation/KLMRegionGrowing/src/itkKLMSegmentationBorder.cxx
+++ b/Modules/Segmentation/KLMRegionGrowing/src/itkKLMSegmentationBorder.cxx
@@ -84,7 +84,6 @@ KLMSegmentationBorder::PrintBorderInfo()
   itkDebugMacro(<< "------------------------------");
   itkDebugMacro(<< "------------------------------");
 
-  std::cout << "Location      : " << this << std::endl;
-  std::cout << "Lambda        : " << m_Lambda << std::endl;
+  std::cout << "Location      : " << this << std::endl << "Lambda        : " << m_Lambda << std::endl;
 }
 } // namespace itk
diff --git a/Modules/Segmentation/KLMRegionGrowing/src/itkKLMSegmentationRegion.cxx b/Modules/Segmentation/KLMRegionGrowing/src/itkKLMSegmentationRegion.cxx
index 3a0ececbad9..77180fd6e57 100644
--- a/Modules/Segmentation/KLMRegionGrowing/src/itkKLMSegmentationRegion.cxx
+++ b/Modules/Segmentation/KLMRegionGrowing/src/itkKLMSegmentationRegion.cxx
@@ -461,13 +461,13 @@ KLMSegmentationRegion::PrintRegionInfo()
   // If there are border pointers print the results
   RegionBorderVectorIterator tempVectorIt;
 
-  std::cout << "------------------------------" << std::endl;
-  std::cout << "Location   : " << this << std::endl;
-  std::cout << "Label      : " << (this->GetRegionLabel()) << std::endl;
-  std::cout << "Area       : " << (this->GetRegionArea()) << std::endl;
-  std::cout << "Mean       : " << (this->GetMeanRegionIntensity()) << std::endl;
-  std::cout << "Num Borders: " << static_cast<int>(m_RegionBorderVector.size()) << std::endl;
-  std::cout << "++++++++++++++++++++++++++++++" << std::endl;
+  std::cout << "------------------------------" << std::endl
+            << "Location   : " << this << std::endl
+            << "Label      : " << (this->GetRegionLabel()) << std::endl
+            << "Area       : " << (this->GetRegionArea()) << std::endl
+            << "Mean       : " << (this->GetMeanRegionIntensity()) << std::endl
+            << "Num Borders: " << static_cast<int>(m_RegionBorderVector.size()) << std::endl
+            << "++++++++++++++++++++++++++++++" << std::endl;
 
   // If there are border pointers print the results
   tempVectorIt = m_RegionBorderVector.begin();
