C++ LANGUAGE BINARY OPERATORS OVERLOADING

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C++ LANGUAGE BINARY OPERATORS OVERLOADING

Binary Operators Overloading 


The unary operators take two arguments and following are 
the examples of Binary operators. You use binary operators 
very frequently like addition (+) operator, subtraction (-) 
operator and division (/) operator. 

Following example explains how addition (+) operator can be 
overloaded. Similar way, you can overload subtraction (-) 
and division (/) operators. 


#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; 
} 
When the above code is compiled and executed, it produces the following result: 
Volume of Box1 : 210 
Volume of Box2 : 1560 
Volume of Box3 : 5400