Distance Measuring Example using Unary Operator in C++

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The program defines a class Distance which has two private member variables feet and inches. It also defines a constructor to initialize the values of feet and inches, and a member function displayDistance() to display the values of the object. The program also overloads the unary minus operator - for the Distance class using the operator-() function. When the unary minus operator is applied to a Distance object, the values of feet and inches are negated.

In the main() function, two Distance objects D1 and D2 are created with different values of feet and inches. The unary minus operator is then applied to these objects using the - symbol. The displayDistance() function is then called to display the values of the objects.

Source Code

#include<iostream>
using namespace std;
class Distance
{
   private:
     int feet;
     int inches;
   public:
     Distance()
     {
        feet = 0;
        inches = 0;
     }
     Distance(int ft,int in)
     {
        feet=ft;
        inches=in;
     }
     void displayDistance()
     {
        cout<<"F: "<<feet<<" I:"<<inches<<endl;
     }
     Distance operator- ()
     {
       feet = -feet;
       inches = -inches;
       return Distance(feet, inches);
     }
};
int main()
{
   Distance D1(11, 10),D2(-5, 11);
   -D1;
   D1.displayDistance();
   -D2;
   D2.displayDistance();
   return 0;
}

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Output

F: -11 I:-10
F: 5 I:-11

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