Overloaded '-' operator subtracts two Measures - C++ Class

C++ examples for Class:Operator Overload

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Description

Overloaded '-' operator subtracts two Measures

Demo Code

#include <iostream>
using namespace std;
class Measure/*from w w w  .  j  ava 2  s .c  o m*/
{
   private:
   int feet;
   float inches;
   public:
   Measure() : feet(0), inches(0.0)
   {  }
   Measure(int ft, float in) : feet(ft), inches(in)
   {  }
   void getdist()              //get length from user
   {
      cout << "\nEnter feet: ";  cin >> feet;
      cout << "Enter inches: ";  cin >> inches;
   }
   void showdist()
   { cout << feet << "\'-" << inches << '\"'; }
   Measure operator + ( Measure );  //add two distances
   Measure operator - ( Measure );  //subtract two distances
};
//add d2 to this distance
Measure Measure::operator + (Measure d2)   //return the sum
{
   int f = feet + d2.feet;        //add the feet
   float i = inches + d2.inches;  //add the inches
   if(i >= 12.0)                  //if total exceeds 12.0,
   {                           //then decrease inches
       i -= 12.0;                  //by 12.0 and
       f++;                        //increase feet by 1
   }                           //return a temporary Measure
   return Measure(f,i);          //initialized to sum
}
//subtract d2 from this dist
Measure Measure::operator - (Measure d2)  //return the diff
{
    int f = feet - d2.feet;        //subtract the feet
    float i = inches - d2.inches;  //subtract the inches
    if(i < 0)                      //if inches less than 0,
    {                           //then increase inches
        i += 12.0;                  //by 12.0 and
        f--;                        //decrease feet by 1
    }                           //return a temporary Measure
    return Measure(f,i);          //initialized to difference
}
int main()
{
    Measure dist1, dist3;         //define distances
    dist1.getdist();               //get dist1 from user
    Measure dist2(3, 6.25);       //define, initialize dist2
    dist3 = dist1 - dist2;         //subtract
    //display all lengths
    cout << "\ndist1 = ";  dist1.showdist();
    cout << "\ndist2 = ";  dist2.showdist();
    cout << "\ndist3 = ";  dist3.showdist();
    cout << endl;
    return 0;
}

Result


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