/****************************************************************************
 * buggy-2.c
 *
 * David J. Malan
 * malan@harvard.edu
 *
 * Should swap two variables' values, but doesn't!
 * Can you find the bug?
 ***************************************************************************/

#include <stdio.h>

// function prototype
void swap(int a, int b);

int main(void)
{
    int x = 1;
    int y = 2;

    printf("x is %i\n", x);
    printf("y is %i\n", y);
    printf("Swapping...\n");
    swap(x, y);
    printf("Swapped!\n");
    printf("x is %i\n", x);
    printf("y is %i\n", y);
}

/**
 * Swap arguments' values.
 */
void swap(int a, int b)
{
    int tmp = a;
    a = b;
    b = tmp;
}