【C++】运算符重载示例一

11.1、11.2

mytime0.h

  

   

    

     

    
    

     

      //mytime0.h -- 时间类重载
     
    
   

    

     

    
    

     

      #ifndef MYTIME0_H_
     
    
   

    

     

    
    

     

      #define MYTIME0_H_
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      class Time
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

      private:
     
    
   

    

     

    
    

     
	int hours;
     
    
   

    

     

    
    

     
	int minutes;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      public:
     
    
   

    

     

    
    

     

      	Time();
     
    
   

    

     

    
    

     

      	Time(int h, int m = 0);
     
    
   

    

     

    
    

     
	void AddMin(int m);
     
    
   

    

     

    
    

     
	void AddHr(int h);
     
    
   

    

     

    
    

     
	// 重新设置时间
     
    
   

    

     

    
    

     
	void Reset(int h = 0, int m = 0);
     
    
   

    

     

    
    

     
	Time Sum(const Time & t) const;
     
    
   

    

     

    
    

     
	void Show() const;
     
    
   

    

     

    
    

     

      	~Time();
     
    
   

    

     

    
    

     

      };
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      #endif
     
    
   

    

     

    
    

     
 
     
    
  
 

mytime0.cpp

  

   

    

     

    
    

     

      // mytime0.cpp -- 类的实现
     
    
   

    

     

    
    

     

      #include<iostream>
     
    
   

    

     

    
    

     

      #include "mytime0.h"
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      Time::Time()
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

      	hours = minutes = 0;
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      Time::Time(int h, int m)
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

      	hours = h;
     
    
   

    

     

    
    

     

      	minutes = m;
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      void Time::AddMin(int m)
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

      	minutes += m;
     
    
   

    

     

    
    

     

      	hours += minutes / 60;
     
    
   

    

     

    
    

     

      	minutes %= 60;
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      void Time::AddHr(int h)
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

      	hours += h;
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      void Time::Reset(int h, int m)
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

      	hours = h;
     
    
   

    

     

    
    

     

      	minutes = m;
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      //参数设为引用是为了提高效率
     
    
   

    

     

    
    

     

      //返回值不能是引用，否则由于是局部变量，一会就删除不存在了
     
    
   

    

     

    
    

     

      //而Time在删除现在的sum之前会拷贝副本给调用的
     
    
   

    

     

    
    

     

      Time Time::Sum(const Time & t) const
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

      	Time sum;
     
    
   

    

     

    
    

     

      	sum.minutes = minutes + t.minutes;
     
    
   

    

     

    
    

     

      	sum.hours = hours + t.hours + sum.minutes / 60;
     
    
   

    

     

    
    

     

      	sum.minutes %= 60;
     
    
   

    

     

    
    

     
	return sum;
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      void Time::Show() const
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
	std::cout << hours << "hours, " << minutes << " minutes";
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      Time::~Time()
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

      }
     
    
  
 

usetime0.cpp

  

   

    

     

    
    

     

      //usetime0.cpp -- 使用第一个版本的Time类
     
    
   

    

     

    
    

     

      //记得和mytime0类编译
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      #include<iostream>
     
    
   

    

     

    
    

     

      #include"mytime0.h"
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      int main()
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
	using std::cout;
     
    
   

    

     

    
    

     
	using std::endl;
     
    
   

    

     

    
    

     

      	Time planning;
     
    
   

    

     

    
    

     
	Time coding(2, 40);
     
    
   

    

     

    
    

     
	Time fixing(5, 55);
     
    
   

    

     

    
    

     

      	Time total;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	cout << "计划时间是：";
     
    
   

    

     

    
    

     

      	planning.Show();
     
    
   

    

     

    
    

     
	cout << endl;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	cout << "代码实际时间是：";
     
    
   

    

     

    
    

     

      	coding.Show();
     
    
   

    

     

    
    

     
	cout << endl;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	cout << "调整时间是：";
     
    
   

    

     

    
    

     

      	fixing.Show();
     
    
   

    

     

    
    

     
	cout << endl;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      	total = coding.Sum(fixing);
     
    
   

    

     

    
    

     
	cout << "coding.Sum(fixing) = ";
     
    
   

    

     

    
    

     

      	total.Show();
     
    
   

    

     

    
    

     
	cout << endl;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	return 0;
     
    
   

    

     

    
    

     

      }
     
    
  
 

运行结果

程序解读

其实我已经将重点的标注到程序里了，但是考虑大家未必认真看程序，还是说明有几个重要的地方要注意

文章来源: kings.blog.csdn.net，作者：人工智能博士，版权归原作者所有，如需转载，请联系作者。

原文链接：kings.blog.csdn.net/article/details/99291855