p174 用指针做三个变量的比较.cpp

谭浩强 《C++ 程序设计》第三版的部分课后练习题源码

#include<iostream>

using namespace std;
void change(int*p1,int*p2)
{  int p;
   if(*p1<*p2) { p=*p1;  *p1=*p2;  *p2=p; }
     
     
     
     }
     int main()
     {  int a,b,c;
        int*p1=&a,*p2=&b,*p3=&c;
        cout<<"input three numbers:  ";
        cin>>a>>b>>c;
        if(*p1<*p2)  change(p1,p2);
        if(*p1<*p3)  change(p1,p3);
        if(*p2<*p3)  change(p2,p3);  
        cout<<"max= "<<*p1<<"  min=  "<<*p3;
        cout<<"max= "<<a<<"  min=  "<<c;
        system("pause");
        return 0;
         
         
         
         
         }