#include <stdio.h>

void csere(int *x, int *y)
{
  int tmp;
  tmp = *x;
  *x = *y;
  *y = tmp;
}

int main()
{
  int x = 3, y = 4;
  printf("A fuggveny elott: x = %d, y = %d\n", x, y);
  csere(&x,&y);
  printf("A fuggveny utan: x = %d, y = %d\n", x, y);
  return 0;
}