Write A C++ Program Illustrates The Overloading Of Unary Minus (-) Operator And Return Value.

#include <iostream.h> 
 #include <conio.h> 
 //******Class Definition******** 
 class Minus 
 { 
       private: 
       int a, b, c ; 
                       public: 
  //**********Member Functions *************** 
                       Minus() {} // Default Constructor 
                       Minus(int A, int B, int C) 
                      {a=A; b=B; c=C;} 
                      void display(void) 
                        { 
                             cout << "\t a = " << a<< endl ; 
                             cout << "\t b = " << b << endl ; 
                             cout << "\t c = "<< c << endl ; 
                        } 
 //********Operator Function Definition ******* 
                 Minus operator - (void) // Declarative with the return type Minus 
           { 
                 Minus temp; 
                 temp.a = -a ; 
                 temp.b = -b ; 
                 temp.c = -c ; 
                 return temp; 
           } 
 } ; // End of the class definition 
 //*******Main Functiion************ 
 void main(void) 
         { 
                   clrscr(); 
                   Minus M1(5, 10, -15); // Initialization of the object M1 of type Minus 
                   cout<< "\n Before activating the operator -( ):\n"; 
                   M1.display( ) ; 
                   Minus M2 ; // Definining the object M2 of type Minus 
                   M2 = -M1 ; // Activates the function operator -( ) and 
                   // assigns the value of -M1 to M2 
                   cout<< "\n After activating the operator -( ):\n" ; 
                   M2.display( ) ; 
                   getch(); 
         }