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 height;      // Height of a box
public:

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

{
}

void setHeight( double hei )
{
height = hei;
}
Box operator+(const Box& b)
{
Box box;
box.length = this->length + b.length;
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.setHeight(5.0);

// box 2 specification
Box2.setLength(12.0);
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
```