#include <stdio.h>

swap(int *a, int *b)
{
	int temp;

	temp = *a; *a = *b; *b = temp;
}

main()
{
	int a = 1, b = 4;

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

	exit(0);
}