/* 
 * SwapExample.java
 * -----------------
 * This program shows an example of using arrays
 * when swapping values.
 */

import acm.program.*;

public class SwapExample extends ConsoleProgram {
    	
    public void run() {
    	setFont("Courier New-bold-24");

    	int[] array = new int[5];
    	array[0] = 1;
    	array[1] = 2;
    	
    	println("Buggy swap results:");
    	swapElementsBuggy(array[0], array[1]);
    	println("array[0] = " + array[0]);
       	println("array[1] = " + array[1]);
    	
    	println("Happy swap results:");
    	swapElementsHappy(array, 0, 1);
    	println("array[0] = " + array[0]);
       	println("array[1] = " + array[1]);
    }

    private void swapElementsBuggy(int x, int y) {
    	int temp = x;
    	x = y;
    	y = temp;
    }
    
    private void swapElementsHappy(int[] arr, int pos1, int pos2) {
    	int temp = arr[pos1];
    	arr[pos1] = arr[pos2];
    	arr[pos2] = temp;
    }
    
}