SE Comp Sem-II OOP Prac-3 (Function overloading)

#include<iostream.h>
#include<conio.h>
class feet;

class meters
{
int meter,cms;

public:
meters()
{
meter=0;
cms=0;
}
void getdata();
void display();
friend meters add(meters a,feet b) ;
friend feet add(feet b,meters a) ;
friend meters sub(meters a,feet b) ;
friend feet sub(feet b,meters a) ;
};


class feet
{
int foot,inches;
public:
feet()
{
foot=0;
inches=0;
}
void getdata();
void display();

friend meters add(meters a,feet b) ;
friend feet add(feet b,meters a) ;
friend meters sub(meters a,feet b) ;
friend feet sub(feet b,meters a) ;
};
void meters::getdata()
{
cout<<"\nenter the lenth in meters and centimeters\t";
cout<<"\nmeters\t";
cin>>meter;
cout<<"\ncentimeters\t";
cin>>cms;
}
void feet::getdata()
{
cout<<"\nenter the lenth in feet and inches\t";
cout<<"\nfeet\t";
cin>>foot;
cout<<"\ninches\t";
cin>>inches;
}
void meters::display()
{
 cout<<"\nresult in meters and centimeters\t";
 cout<<meter;
 cout <<".";
 cout<<cms;
 }
 void feet::display()
{
 cout<<"\nresult in feet and inches\t";
 cout<<foot;
 cout <<".";
 cout<<inches;
 }


meters add(meters a,feet b)
{
 int c;
 meters d;
 c=a.meter*100+a.cms+b.foot*30+b.inches*3;
 d.meter=c/100;
 d.cms=c%100;
 return(d) ;
 }

feet add(feet b,meters a)
{
 int c;
 feet d;
 c=a.meter*100+a.cms+b.foot*30+b.inches*2;
 d.foot=c/30;
 d.inches=c%30;
 return(d) ;
}
meters sub(meters a,feet b)
{
  int c;
 meters d;
 c=a.meter*100+a.cms-b.foot*30-b.inches*3;
 d.meter=c/100;
 d.cms=c%100;
 return(d) ;
}
feet sub(feet b,meters a)
{
 int c;
 feet d;
 c=a.meter*100+a.cms-b.foot*30-b.inches*3;
 d.foot=c/30;
 d.inches=c%30;
 return(d) ;
}
int main()
{
feet f,r;
meters m,n;
int o;
float x,y;
char d;
clrscr();

do
{
  cout<<"\nenter your choice\t";
  cout<<"\n1:to add two length  and obtain result in meters \t";
    cout<<"\n2:to add two length  and obtain result in feet \t";
      cout<<"\n3:to subtract two length  and obtain result in meters \t";
    cout<<"\n4:to subtract two length  and obtain result in feet \t";
    cin>>o;
  switch(o)
  {
  case 1:

   cout<<"\nenter the data\t";
  m.getdata();
  f.getdata();
  n=add(m,f);
  n.display();
  break;
    case 2:
    cout<<"\nenter data\t";
  m.getdata();
  f.getdata();
  r=add(f,m);
  r.display();
  break;
    case 3:

    cout<<"\nenter data\t";
  m.getdata();
  f.getdata();
  n=sub(m,f);
  n.display();
  break;
    case 4:

    cout<<"\nenter data\t";
  m.getdata();
  f.getdata();
  r=sub(f,m);
  r.display();
  break;
  default:
  cout<<"\nwrong choice\t";
  break;
  }
   cout<<"\nif you want to continue please press .....y\t";
    cin>>d;
  }while(d=='y'||d=='Y');

return 0;
}