The following table shows the list of binary operators and its purpose.

Function Name Operator Purpose
opBinary - subtract
opBinary * multiply
opBinary / divide
opBinary % remainder of
opBinary ^^ to the power of
opBinary & bitwise and
opBinary | bitwise or
opBinary ^ bitwise xor
opBinary << left-shift
opBinary >> right-shift
opBinary >>> logical right-shift
opBinary ~ concatenate
opBinary in whether contained in

An example is shown below which explains how to overload an binary operator.

### Example

```import std.stdio;

class Box {
public:
double getVolume() {
return length * breadth * height;
}

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

void setBreadth( double bre ) {
}

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

Box opBinary(string op)(Box b) {
if(op == "+") {
Box box = new Box();
box.length = this.length + b.length;
box.height = this.height + b.height;
return box;
}
}
private:
double length;      // Length of a box
double height;      // Height of a box
};

// Main function for the program
void main( ) {
Box box1 = new Box();    // Declare Box1 of type Box
Box box2 = new Box();    // Declare Box2 of type Box
Box box3 = new Box();    // 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();
writeln("Volume of Box1 : ", volume);

// volume of box 2
volume = box2.getVolume();
writeln("Volume of Box2 : ", volume);

// Add two object as follows:
box3 = box1 + box2;

// volume of box 3
volume = box3.getVolume();
writeln("Volume of Box3 : ", volume);
}
```

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
```