Binary Operator + to add two object

#include <iostream.h>
#include <conio.h>

class distance
{
 int feet;
 float inches;
 public:
   distance()
   { feet=0;inches=0.0;}
   distance(int ft,float in)
   { feet=ft; inches=in;}
   void getdist()
   {
     cout<<"\nEnter feet   : ";
     cin>>feet;
     cout<<"\nEnter Inches : ";
     cin>>inches;
   }
   void showdist()
   {
     cout<<feet<<"\'-"<<inches<<'\"';
   }

   distance operator + (distance);
 };

 distance distance :: operator + (distance d2)
 {
   int   f = feet + d2.feet;
   float i = inches + d2.inches;
   if(i >= 12.0)
     {
       i = i - 12.0;
       f++;
     }
   return distance(f,i);
 }