Write a C++ program to add two complex numbers.

Question

What does the following code return ?

class Complex {
    public:
        Complex(double x, double y) : x(x), y(y) {}
        double getX() const {return x;}
        double getY() const {return y;}
        Complex operator+(Complex z2);
    private:
        double x;
        double y;
    };

Complex Complex::operator+(Complex z2) {
        return Complex(x+z2.getX(), y+z2.getY());
    }

int main() {
        Complex z1(1, 1);
        Complex z2(2, 2);
        Complex z3 = z1+z2;
        cout << z1.getX() << ',' << z1.getY() << endl;
        cout << z2.getX() << ',' << z2.getY() << endl;
        cout << z3.getX() << ',' << z3.getY() << endl;
        return 0;
    }

Accepted Answer

1,1;  
2,2;  
3,3;

Answer

3,3;  
2,2;  
3,3;

Answer

3,3;  
3,3;  
3,3;

Answer

1,1;   
3,3;   
3,3;

Question from the C++ - Fundamentals test

Write a C++ program to add two complex numbers.