Unary increment (++) and decrement (--) operator overloading program in c++.

/*C++ program for unary increment (++) and decrement (--) operator overloading.*/
 
#include<iostream>
using namespace std;
 
class NUM
{
    private:
        int n;
         
    public:
        //function to get number
        void getNum(int x)
        {
            n=x;
        }
        //function to display number
        void dispNum(void)
        {
            cout << "value of n is: " << n;
        }
        //unary ++ operator overloading
        void operator ++ (void)
        {
            n=++n;
        }
        //unary -- operator overloading
        void operator -- (void)
        {
            n=--n;
        }
};
int main()
{
    NUM num;
    num.getNum(10);
     
    ++num;
    cout << "After increment - ";
    num.dispNum();
    cout << endl;
     
    --num;
    cout << "After decrement - ";
    num.dispNum();
    cout << endl;
    return 0;
}

Output

    After increment - value of n is: 11
    After decrement - value of n is: 10