D语言类成员函数

import std.stdio;

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

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

void main( ) { 
   Box Box1 = new Box();    // Declare Box1 of type Box 
   Box Box2 = new Box();    // Declare Box2 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(); 
   writeln(Volume of Box1 : ,volume); 

   // volume of Box 2 
   volume = Box2.getVolume(); 
   writeln(Volume of Box2 : , volume); 
}