#include<stdio.h>

/*
 * This is the C++ way
 * there are not references "&" in C
 * you have to pass the address explicitly
 *
void swap ( int & x, int & y )
{
    int tmp = x;
    x = y;
    y = tmp;
}
*/

void swap ( int * x, int * y )
{
    int tmp = *x;
    *x = *y;
    *y = tmp;
}

int main()
{
    int a = 3;
    int b = 5;

    printf ( "a = %d, b = %d\n", a, b );
    swap ( &a, &b );
    printf ( "a = %d, b = %d\n", a, b );

    return 0;
}