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C++ program for unary logical NOT (!) operator overloading

This program will demonstrate example of unary logical NOT (!) operator overloading in c++ programming language.

Unary logical NOT (!) operator overloading program in C++

// C++ program for unary logical NOT (!)
// 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;
    }
};

int main()
{
    NUM num;
    num.getNum(10);
    cout << "Before calling Operator Overloading:";
    num.dispNum();
    cout << endl;

    !num;
    cout << "After  calling Operator Overloading:";
    num.dispNum();
    cout << endl;

    return 0;
}

Output

    Before calling Operator Overloading:value of n is: 10
    After  calling Operator Overloading:value of n is: 0