C++ 二元运算符重载

  • 二元运算符重载

    二元运算符有两个参数,以下是二元运算符的示例。您经常使用二进制运算符,例如加法(+)运算符,减法(-)运算符和除法(/)运算符。下面的示例说明如何重载加法(+)运算符。同样,您可以重载减法(-)和除法(/)运算符。
  • C++中的函数重载

    在同一个作用域中,可以为同一个函数名具有多个定义。函数的定义必须在参数列表中的参数类型和/或数量上彼此不同。您不能重载仅在返回类型上有所不同的函数声明。以下是使用相同函数print()打印不同数据类型的示例-
    
    #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;
    }
    

    尝试一下

    编译并执行上述代码后,将产生以下结果-
    
    Volume of Box1 : 210
    Volume of Box2 : 1560
    Volume of Box3 : 5400