C++入门基础知识148—【关于C++ 二元运算符重载】

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#include <iostream>

using namespace std;

class Box

{

   double length;      // 长度

   double breadth;     // 宽度

   double height;      // 高度

public:

   double getVolume(void)

   {

      return length * breadth * height;

   }

   void setLength( double len )

   {

       length = len;

   }

   void setBreadth( double bre )

   {

       breadth = bre;

   }

   void setHeight( double hei )

   {

       height = hei;

   }

   // 重载 + 运算符，用于把两个 Box 对象相加

   Box operator+(const Box& b)

   {

      Box box;

      box.length = this->length + b.length;

      box.breadth = this->breadth + b.breadth;

      box.height = this->height + b.height;

      return box;

   }

};

// 程序的主函数

int main( )

{

   Box Box1;                // 声明 Box1，类型为 Box

   Box Box2;                // 声明 Box2，类型为 Box

   Box Box3;                // 声明 Box3，类型为 Box

   double volume = 0.0;     // 把体积存储在该变量中

   // Box1 详述

   Box1.setLength(6.0);

   Box1.setBreadth(7.0);

   Box1.setHeight(5.0);

   // Box2 详述

   Box2.setLength(12.0);

   Box2.setBreadth(13.0);

   Box2.setHeight(10.0);

   // Box1 的体积

   volume = Box1.getVolume();

   cout << "Volume of Box1 : " << volume <<endl;

   // Box2 的体积

   volume = Box2.getVolume();

   cout << "Volume of Box2 : " << volume <<endl;

   // 把两个对象相加，得到 Box3

   Box3 = Box1 + Box2;

   // Box3 的体积

   volume = Box3.getVolume();

   cout << "Volume of Box3 : " << volume <<endl;

   return 0;

}