#include <conio.h>
#include <stdio.h>

void swap (int *x, int *y){
     int z = *x;
     *x = *y;
     *y = z;
}

int main()
{
    int c = 10, b = 15;
    swap(&c, &b);
    printf ("%d %d", c ,b );
    getch();
return 0;
}