Routine in destination object

Routine in destination object

When the conversion routine is in the destination class, we use a one-argument constructor. However, things are complicated by the fact that the constructor in the destination class must be able to access the data in source class to perform the conversion. The polar data – radius & angle –are private, so we must provide special function to allow direct access it.

#include<iostream.h>

#include<conio.h>

#include <math.h>

class polar

{

      double radius,angle;          //x and y cordinate

   public:

      polar()        //constructor

      { radius=0.0;

            angle=0.0; }

    polar(double r, double a)

      {   radius=r; angle=a;   }

   void display()

   { cout<<"(" <<radius<<","<<angle<<")"; }

      double getr()

      {  return radius;   }

      double geta()

      {   return angle;   }

};

class rectangular

{

      double xco,yco;          //x and y cordinate

   public:

      rectangular()          //constructor

      {   xco=0.0; yco=0.0;   }

      rectangular(double x, double y)

      {   xco=x; yco=y;   }

      rectangular (polar p)

      {

             double r=p.getr();

             double a=p.geta();

             xco=r * cos(a);

             yco=a * sin(a);

      }

      void display()

      {    cout<<"(" <<xco<<","<<yco<<")";  }

};

void main()

{

   rectangular rec;         //rectangular using constructor1

   polar pol(10.0,0.785398);     //polar using constructor1

   rec=pol;        //convert polar to rectangular using conversion function

   clrscr();

   cout<<"\nPolar Values=";

   pol.display();

   cout<<"\nrectangular Values=";

   rec.display();

   getch();

}