C++ 二元运算符重载

二元运算符接受两个参数，下面是二元运算符的示例。你经常使用二元运算符，例如加法（+）运算符、减法（-）运算符和除法（/）运算符。

下面的示例说明了如何重载加法（+）运算符。类似地，你可以重载减法（-）和除法（/）运算符。

#include <iostream>
using namespace std;

class Box {
   double length;      // Length of a box
   double breadth;     // Breadth of a box
   double height;      // Height of a box

   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;
   }

   // Overload + operator to add two Box objects.
   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;
   }
};

// Main function for the program
int main() {
   Box Box1;                // Declare Box1 of type Box
   Box Box2;                // Declare Box2 of type Box
   Box Box3;                // Declare Box3 of type Box
   double volume = 0.0;     // Store the volume of a box here

   // box 1 specification
   Box1.setLength(6.0); 
   Box1.setBreadth(7.0); 
   Box1.setHeight(5.0);

   // box 2 specification
   Box2.setLength(12.0); 
   Box2.setBreadth(13.0); 
   Box2.setHeight(10.0);

   // volume of box 1
   volume = Box1.getVolume();
   cout << "Volume of Box1 : " << volume <<endl;

   // volume of box 2
   volume = Box2.getVolume();
   cout << "Volume of Box2 : " << volume <<endl;

   // Add two object as follows:
   Box3 = Box1 + Box2;

   // volume of box 3
   volume = Box3.getVolume();
   cout << "Volume of Box3 : " << volume <<endl;

   return 0;
}

当上述代码被编译和执行时，会产生以下结果−

Volume of Box1 : 210
Volume of Box2 : 1560
Volume of Box3 : 5400