##### Operator overloading in c++

Could anyone explain me how to perform operator overloading in c++ with an example

##### 2Comments
Vivek Vikram Singh
29 Oct 2015 09:15 pm

If you want a complete and best learning experience, I suggest you to go for a book called C++ Primer Plus.Link to it is here :  http://www.flipkart.com/c-primer-plus-english-6/p/itme3gyu82vhnfjz

Arvind Rawat
2 Nov 2015 12:45 pm

In C++ Operator overloading allows the use of operators to be extended to work not just with built-in types but also classes. A programmer can provide his or her own operator to a class by overloading the built-in operator to perform some specific computation when the operator is used on objects of that class. In the below example, addition (+) operator is overloaded to perform addition of two Box class objects.

#include <iostream>
using namespace std;

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

public:
void setLength( double len )
{
length = len;
}

void setBreadth( double bre )
{
breadth = bre;
}

void setHeight( double hei )
{
height = hei;
}

double getVolume(void)
{
return length * breadth * height;
}

// 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;
}