Basic Rules and Idioms for Operator Overloading in C++

Hello everyone! I'm learning C++ and trying to understand operator overloading. I wrote a simple class for working with complex numbers, but ran into a bunch of problems. Here's my code: ```cpp class Complex { public: double real, imag; Complex(double r, double i) : real(r), imag(i) {} // Operator + overloading Complex operator+(Complex other) { return Complex(real + other.real, imag + other.imag); } // Operator == overloading bool operator==(Complex other) { return (real == other.real && imag == other.imag); } }; int main() { Complex a(3.0, 4.0); Complex b(1.0, 2.0); Complex c = a + b; // Works Complex d = 5.0 + a; // Error! Why? if (c == d) {} // Works, but I heard this is wrong } ```