练习6.21

#include <iostream>
using namespace std;
int change(int n,int *p){
if(n>*p)
return n;
else
return *p;
}
int main()
{
int m=3;
int n=5;
int *p=&m;
cout<<change(n,<span style="color:#ff0000;">p</span>)<<endl;
return 0;
}