#include <stdio.h>

int fun(int *x,int y)
{
  int t ;
  t = *x ; *x = y ;
  return(t) ;
}

main()
{
  int a = 3, b = 8 ;

  printf("%d  %d\n", a, b) ;
  b = fun(&a, b) ;
  printf("%d  %d\n", a, b) ;
}