#include "stdio.h"
void main()
{
  int a,b;

  int swap( int *p, int *q);
  printf("input two numbers:");
  scanf("%d%d",&a,&b);
  printf("jiaohuanqian a=%d b=%d\n",a,b);
  swap(&a,&b);
  printf("%d%d",a,b);
  }
  int swap(int *p,int *q)
  {int temp;
   temp=*p;*p=*q;*q=temp;
    }