countpp2.cpp

来自「本课程主要介绍面向对象程序设计的方法和c++语言的基本概念。以c++语言中的面向」· C++ 代码 · 共 38 行

// countpp2.cpp
// increment counter variable with ++ operator, return value
#include <iostream>
using namespace std;
////////////////////////////////////////////////////////////////
class Counter
   {
   private:
      unsigned int count;      //count
   public:
      Counter() : count(0)     //constructor
         {  }
      unsigned int get_count() //return count
         { return count; }
      Counter operator ++ ()   //increment count
         {
         ++count;              //increment count
         Counter temp;         //make a temporary Counter
         temp.count = count;   //give it same value as this obj
         return temp;          //return the copy
         }
   };
////////////////////////////////////////////////////////////////
int main()
   {
   Counter c1, c2;                       //c1=0, c2=0

   cout << "\nc1=" << c1.get_count();    //display
   cout << "\nc2=" << c2.get_count();

   ++c1;                                 //c1=1
   c2 = ++c1;                            //c1=2, c2=2

   cout << "\nc1=" << c1.get_count();    //display again
   cout << "\nc2=" << c2.get_count() << endl;
   return 0;
   }