C++ | Operator Overloading | Question 5

How does C++ compiler differs between overloaded postfix and prefix operators?
(A) C++ doesn’t allow both operators to be overloaded in a class
(B) A postfix ++ has a dummy parameter
(C) A prefix ++ has a dummy parameter
(D) By making prefix ++ as a global function and postfix as a member function.


Answer: (B)

Explanation: See the following example:

class Complex
{
private:
    int real;
    int imag;
public:
    Complex(int r, int i)  {  real = r;   imag = i; }
    Complex operator ++(int);
    Complex & operator ++();
};

Complex &Complex::operator ++()
{
    real++; imag++;
    return *this;
}

Complex Complex::operator ++(int i)
{
    Complex c1(real, imag);
    real++; imag++;
    return c1;
}

int main()
{
    Complex c1(10, 15);
    c1++; 
    ++c1;
    return 0;
}

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