package dk.norfeldt.lasse.assignment2;

/**
 *
 * @author Norfeldt <lasse@norfeldt.dk>
 */
import java.util.Scanner;

public class TestVars {

    public void runMe() {
        //Part 2
    /*2. In method runMe() defines three integer variables x, y and z and
         set them to the initial values of 0, 6 and 10, respectively.
        */
        int x = 0, y = 6, z = 10;

        //2a. Print out the value of z as “z = 10”.
        System.out.println("z = "+z);

        /*2b. Add the following code “z++;” and try to figure out the value
         of z before you print it out in Java.
         Then print it out to check if you assumption was correct.
         */
        z++;    //Expect it to be the same as "z = z + 1;" so it prints out 11.
        System.out.println("z after z++; = "+z);

        /*2c. Set the value of z back to 10 and add this line of code “++z;”.
         Then try to figure out the value of z before you print it out in Java.
         Then print it out to check if you assumption was correct.
         */
        z = 10;
        ++z;    /*Expect it to be the same because it is still just one variable
                 * that the increment operator is beeing used on.
                 */
        System.out.println("\"z = 10;\" and \"++z;\" gives "+z);

        /*2d. Define two int variables x and y and initialize them as x=0  and
         y=6”. Then add the following code “x = ++y;” and try to figure out the
         values before printing them out in Java
        */
        x = ++y;    /*Expect it to do the incremation first (so y is assiged to
                      the value 6 + 1) and then assign that value to the
                      variable x. This will give a print out that says
                      x = 7 and y = 7
                    */
        System.out.println("x = "+x);
        System.out.println("y = "+y);

        /* 2e. Now set x and y back to their original values 0 and 6,
         respectively. Add the following line of code “x = y++”. Do the same
         as in 2d.
         */
        x = 0; y = 6;

        x = y++;    /*Expect it to do assign the value of y to x and THEN do the
                     * incremation of y. This means that the print out will be
                     * x = 6 and y = 7
                     */

        System.out.println("x = "+x);
        System.out.println("y = "+y);
        /*Was expecting this because in the prefix form, the operand is
         incremented (or decremented) before the value is obtained for use in the
         expression. In postfix form, the previous value is obtained for use in
         the expression, and THEN the operand is incremented (or decremented).
        */

        /*2f. Add the lines of code you see below and explain the semantic
         difference between the + operators in the System.out.println() methods.
         Afterwards remove the blank space after the first + in the first
         System.out.println() method and see what happens.
                z = 6;
                System.out.println("z : " + ++ z);
                z = 6;
                System.out.println("z: " +z++);
         */
        z = 6;
        System.out.println("z : " + ++ z);

        //System.out.println("z : "+++z);
        /*Gives a syntax error because the operator + requeres a variable and
         * does not work on an int - the ++ operator always return integer value.
         */

        z = 6;
        System.out.println("z: " +z++);

        /*2g. Set x and y back to their original values, i.e. 0 and 6,
         respectively. Then print out the result of the division y/x.
         */
        x = 0; y = 6;
        //System.out.println(y/x);
        // It will not print it out. Because division by zero cannot be done.

        /* 2i. Declare two new float variables float_x and float_y and assign
         them the values 14 and 4, respectively. Then print out the result of
         the division float_x / float_y and the result of the rest of that
         division, if possible*/
        float float_x = 14;
        float float_y = 4;
        System.out.println(float_x/float_y);

        /* 3. Before testing out the following line in Java, please try to think
         whether it will generate a compile-error or not:
         */
        // Have no idea of what
        String myStrangeString = + 1 + - - + - - + + + + +  1 + " ";
        System.out.println(myStrangeString);

        /*4. You should know by now that System.out.println(whatever) can be
         used to print out variables or literals or a combination thereof.
         What you might don’t know is however, how you can read in data: here
         you will learn one way for doing so. You will make use of the class
         Scanner that you have to import into your java code by adding this line
         before the class declaration line of TestVars i.e. like:
        */
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter your age: ");
        int age = sc.nextInt();
        System.out.println("So, you are " + age + " years old");
    }
}