成员函数是特定于类的函数，它可以访问该对象的类的所有成员，在对象上使用点运算符(.)调用成员函数。

让我们提出以上概念来设置和获取类中不同类成员的值-

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); 
} 

编译并执行上述代码后，将产生以下输出-

Volume of Box1 : 210 
Volume of Box2 : 1560