C++ Program Illustrates The Overloading Of Unary Minus (-) Operator

#include <iostream.h> 
 #include <conio.h> 
 class Minus 
 { 
     private: 
                       int a, b, c; 
     public: 
                       Minus( ) {} // Default Constructor 
                       Minus(int A, int S, int C) 
               { 
                      a = A; 
                      b = S; 
                      c = C; 
                } 
                      void display(void); 
  //********Declaration of the operator function********** 
                      void operator - ( ); 
  }; // End of the Class Definition 
  //***********Member Function Definitions************* 
             inline void Minus:: display(void) 
        { 
            cout<<"\t a="<< a <<endl; 
           cout<<"\t b=" << b <<endl; 
           cout<<"\t c = "<< c<< endl; 
         } 
    //*********Definition of the operator function*********** 
           inline void Minus :: operator - () 
         { 
                 a = -a; 
                 b = -b; 
                 c = -c; 
            //*************Main Function Definition************** 
         } 
            void main(void) 
       { 
             clrscr(); 
             Minus M(5, 10, -15); 
             cout <<"\nBefore Activating the Operator - ( )\n"; 
             M.display( ); 
             -M; 
             cout<< "\nAfter Activating the Operator - ( )\n"; 
             M.display( ); 
             getch(); 
        }