main(){
	double a, b;
	char* c, d;
	a = 1.3;
	b = 2.5;
	c=malloc(1);
	d=malloc(1);

	printf("Por ahora valen a = %lf , b = %lf\n", a, b);
	swap((long*)&a,(long*)&b);
	printf("ahora valen a = %lf , b = %lf\n", a, b);

	printf("Por ahora valen c = %p , d = %p\n", c, d);
	swap((long*)&c,(long*)&d);
	printf("ahora valen c = %p , d = %p\n", c, d);
}

swap(a,b)
long	*a,*b;
{
	(*a) ^= (*b);
	(*b) ^= (*a);
	(*a) ^= (*b);
}