how we minus the distances

#include<iostream>
using namespace std;
     class Distance
                        {
      private:
              int feet;
              float inches;
      public:
             Distance()
                        {
                       feet=0;
                       inches=0;
                       }


             Distance(int f , float in)
                          {
                          feet=f;
                          inches=in;
                          }
             void get_Dist()
                         {
                  cout<<"enter feet =";
                  cin>>feet;
                  cout<<"enter inches =";
                  cin>>inches;
                  }
             void disp_Dist()
                  {
                  cout<<" Distancee = "<<feet<<"\'_ "<<inches<<"\''"<<endl;
                  }
             Distance operator -(Distance d5)
                        {
                      int f;
                      float i;
              float i2=feet*12+inches;
              float i1=d5.feet*12+d5.inches;
              if(i2<i1)
              {
                       f=0;
                       i=0;
                       }
                       else
                       {
                           if(inches<d5.inches)
                           {
                                               inches+=12;
                                               feet--;
                                               }
                       f=feet-d5.feet; 
                       i=inches-d5.inches;
                      while(i>=12)
                      {
                                  i-=12;
                                  f++;
                                  }
                                  }
                      return Distance(f,i);
                      }
};

int main()
{
    Distance d1,d2(5,2);
    d1.get_Dist();
    Distance d3=d2-d1;
    d3.disp_Dist();
    system("pause");
}