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# C ++ binary operator overload

A binary operator requires two parameters, the following is an example of a binary operator. We usually use the plus operator (+), subtraction operator (-), multiplication operator (*) and division operator (/) are all binary operators. Like plus (+) operator.

The following example demonstrates how to add overloaded operator (+). Similarly, you can also try overloaded subtraction operator (-) and division operator (/).

```#include <iostream>
using namespace std;

class Box
{
double length;      // 长度
double height;      // 高度
public:

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

{
}

void setHeight( double hei )
{
height = hei;
}
// 重载 + 运算符，用于把两个 Box 对象相加
Box operator+(const Box& b)
{
Box box;
box.length = this->length + b.length;
box.height = this->height + b.height;
return box;
}
};
// 程序的主函数
int main( )
{
Box Box1;                // 声明 Box1，类型为 Box
Box Box2;                // 声明 Box2，类型为 Box
Box Box3;                // 声明 Box3，类型为 Box
double volume = 0.0;     // 把体积存储在该变量中

// Box1 详述
Box1.setLength(6.0);
Box1.setHeight(5.0);

// Box2 详述
Box2.setLength(12.0);
Box2.setHeight(10.0);

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

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

// 把两个对象相加，得到 Box3
Box3 = Box1 + Box2;

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

return 0;
}
```

When the above code is compiled and executed, it produces the following results:

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