程序代码：

#include<stdio.h>
int max();
int max(int x,int y)
{
     return x>y?x:y;
}

int main()
{

 int (*p)(int,int)=&max;

 int a,b,c,d;

 printf("please input three tnteger\n");

 scanf("%d%d%d",&a,&b,&c);

 printf("\n%d\n",(*p)(a,b));
}