#include <stdio.h>

static void
swap1 (int *a, int *b)
{
	int c;

	c = *a;
	*a = *b;
	*b = c;
}


int main (int argc, char **argv)
{
	int a, b;

	a = 4;
	b = 3;

	printf ("a: %d, b: %d\n", a, b);
	swap1 (&a, &b);
	printf ("a: %d, b: %d\n", a, b);
	return 0;
}