D Programming - Class member functions

A member function is a function specific to a class. It operates on any object of the class of which it is a member, and has access to all the members of a class for that object.

A member function is called using a dot operator (.) on a object where it manipulates data related to that object.

Let us put above concepts to set and get the value of different class members in a class −

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); 
} 

When the above code is compiled and executed, it produces the following result −

Volume of Box1 : 210 
Volume of Box2 : 1560