#include<stdio.h>
void swop(int *x, int *y)
{
int t;
t = *x;
*x = *y;
*y = t;
}
int main(void)
{
int a = 3;
int b = 4;
int *x = &a;
int *y = &b;
swop(x,y);
printf("%d %d",*x,*y);
return 0;
}