package CIS115;

public class Parameters {

    //methods with main need to be marked static
    public static void doSomething(int a, String str, double b) {
        int x = 2 * a;
        double y = (3 * b);
        System.out.println(str + " " + (x + y));
    }

    public static void pr(int a, String str, double b) {
        int x = 2 * a;
        double y =  (3 * b);
        System.out.println(str + " " + (x + y));
    }

    public static void method1(int x, int y, int z) {
        System.out.println(x + " " + y + " " + z);
        x = y + z;
        y = 10;
        z = y;
    }

    public static void method2(int[] list, int x) {
        x = 10;
        list[0] = 10;
    }

    public static void even(int num) {
        if (num % 2 == 0) {
            System.out.println("even");
        } else {
            System.out.println("odd");
        }
    }
    
    public static void repeater(String word, int times) {
        for (int i = 0; i < times; i++) {
            System.out.println(word);
        }
    }


    public static void main(String[] args) {
        // calling methods with literals
        System.out.println("doSomething(5, \"Java\", 5.5);");
        doSomething(5, "Java", 5.5);
        System.out.println("-----\n"+"pr(1, \"hello\", 2);");
        pr(1, "hello", 2);
        System.out.println("-----\n"+"pr(2, \"goodbye\", 1);");
        pr(2, "goodbye", 1);

        // calling methods with variables
        int z = 3;
        int a = 4;
        String s = "words";
        System.out.println("-----\n"+"pr(z, s, a);");
        pr(z, s, a);
        System.out.println("-----\n"+"pr(a, s, z);");
        pr(a, s, z);

        // java is call by value, these variables are not changed
        int q = 55;
        int r = 22;
        System.out.println("-----\n"+"before method 1: q="+ q + " r=" + r);
        System.out.println("-----\n"+"method1(1, q, r);");
        method1(1, q, r);
        System.out.println("-----\n"+"method1(q, r, q + r);");
        method1(q, r, q + r);
        System.out.println("-----\n"+"method1(q, q, q);");
        method1(q, q, q);
        System.out.println("-----\n"+"after method 1: q="+ q + " r=" + r);
        
        // call by value means we pass the int var, so
        // the method can change the values in the array
        int[] list = new int[]{2, 4, 6, 8, 10};
        int y = 4;
        System.out.println("-----\n"+"before method 2: list[0]="+ list[0] + " y=" + y);
        method2(list, y);
        System.out.println("after method 2: list[0]="+ list[0] + " y=" + y);
        
        System.out.println("-----\n"+"even(828);");
        even(828);
        System.out.println("-----\n"+"even(829);");
        even(829);
        
        System.out.println("-----\n"+"repeater(\"hello\", 9);");
        repeater("hello", 9);
        System.out.println("-----\n"+"repeater(\"xyz\", 5);");
        repeater("xyz", 5);
    }

}