Program is to find the area of room:

Program is to find the area of room with default values using classes & object

class room

  {

  private:

    int len;

    int wid;

    int hei;

  public:

       int ar;

  // function definitions

     void assign()

       {

      len=20;

      wid=30;

      hei=40;

       }

    void area()

     {

    ar=2*(len*wid+wid*hei+hei*len);

     }

    void disp()

       {

    cout<<" length "<

    cout<<" breadth "<

    cout<<" height "<

    cout<<" area "<

       }

  };

 void main()

   {

   clrscr();

   room area1;

   area1.assign();

   area1.area();

   area1.disp();

   }