老头

#include<stdio.h>

 int main()

 {
     void swap(int *pointer_1,int *pointer_2);/*如果要调用函数，即调用函数，必须在主函数中对函数进行声明，应该注意*/
     int a,b;
     int *pointer_1, *pointer_2;
     printf("please enter two nums\n");
     scanf("%d%d",&a,&b);
     pointer_1=&a;
     pointer_2=&b;
     if(a<b)
     {
         swap(pointer_1,pointer_2);
     }
       printf("max=%d,min=%d\n",*pointer_1,*pointer_2);
     return 0;

 }

 void swap(int *p1,int *p2)

 {
     int p;
      p=*p1;            /*****************在这修改了********************************/
      *p1=*p2;
      *p2=p;

 }