Week1.java

public class Week1 { //declaration of class
    public static void main(String[] args) { //Main Method: Operates code

        //SYNTAX

        //Declaring Variables
        double test = 4.0;
        //type name = value;
        final double pi = 3.14;
        //final signifies that you cannot change it later in the code

        //Printing
        System.out.print("Hello");
        //Prints Hello
        System.out.println("Hello");//(More useful)
        //Prints Hello and then creates a new line beneath it
        System.out.println(1);
        //number values do not have to be in quotations.

        //VARIABLE TYPES

        //Double variables: Can hold large decimal values
        double alpha = 1.0;
        double beta = 2.0;
        System.out.println(alpha + beta);// would output 3.0

        //Integer Variables: can hold integer values
        int alpha2 = 1;
        int beta2 = 2;
        System.out.println(alpha2 + beta2);// would output 3

        //String Variable: Can hold multiple characters
        String delta = "Hello";
        System.out.println(delta);//would output Hello

        //Char Variable: Can hold one character
        char letter = 'a';

        //OPERATORS

        double a = beta + alpha;//Addition: a = 3.0
        double b = beta - alpha;//Subtraction: b = 1.0
        double c = beta * alpha;//Multiplication: c = 2.0
        double d = alpha / beta;//Division: d = 0.5
        double f = beta % alpha;//Modulus:(provides remainder) f = 0.0
        double g = alpha++;//Increment:(adds 1) g = 2.0;
        double h = alpha--;//Decrement:(subtracts 1) h = 0.0;

        //CASTING

        double decimal = 1.71;
        //int integer = casting;
        //will not work because integers cannot hold decimal values.
        //Instead you should cast the double as an int.
        int integer = (int) decimal;
        // changes the double value into an int by cutting off decimals NOT ROUNDING


        double fraction = 1 / 2;//fraction will = 0.0
        //while 1/2 = 0.5 in real life, when two ints are divided in java, the result is also an int.
        //This means the resulting 0.5 would be shortened to 0

        //to fix this either the numerator or denominator must be made a double
        fraction = 1.0 / 2;
        //or the number must be cast as a double
        fraction = (double) 1 / 2;//fraction = 0.5

        //Extra notes

        /* typing // creates a comment that does not change the code
         * words like double, int, and String are key words that cannot to be used as variable names
         * the = sign sets a value to the variable, it does not signify that the values are equal
         * while doubles cannot go into ints, ints can always go into doubles
         * (ie. double a = 1 works, but int a = 1.2 does not)
         * there are many more variable types, but most are not useful for beginners right now
         */

        //If you have any questions feel free to ask any of the teachers on classroom.
        //We would be more than happy to help.

    }
}