prefix and postfix ++ overloading

#include <iostream>

using namespace std;

class OneD {

    int x;

public:

    OneD() { x = 0; }

    OneD(int i) {x = i; }

 

    OneD operator++(); // prefix version of ++

    OneD operator++(int notused); // postfix version of ++

    void show() ;

};

// Overload the prefix version of ++.

OneD OneD::operator++()

{

    x++;  // increment x, y, and z

    return *this; // return altered value

}

// Overload the postfix version of ++.

OneD OneD::operator++(int notused)

{

    OneD temp = *this; // save original value

    x++; // increment x

    return temp; // return original value

}

void OneD::show( )

{

    cout << x << std::endl;

}

int main()

{

    OneD a(1);

    OneD b(1);

    cout << "Original value of a: ";

    a.show();

    cout << "Value after ++a: " ;

    (++a).show();

    cout << "Original value of b: ";

    b.show();

    cout << "Value after ++b: " ;

    (b++).show() ;

    cout << "final Value of b: " ;

    b.show();

    return 0;

}