#include <stdio.h>

         /* arguments x and y are "pointers to ints" */
void swap( int* x, int* y )
{
	int temp;
	temp = *x;      /*  get value at x, put it in temp  */
	*x = *y;        /*  put the value at x into the value at y  */
	*y = temp;
}

int main( int c, const char * arg[] )
{
	int a = 7, b = 5;

	swap( &a, &b );  /* pass addresses of a and b to swap */

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

	return 0;
}