Destructor with copy constructor

Question

I want to use destructor in CPP, but, compiler is giving warning "undefined reference".

class trial{
private:
    int number;
public:
    trial(){};
    trial(int num) {
        number=num;
    };
    ~trial();
};

Trial class constructor gets value from main function. Help me by telling me whats incorrect in constructor. Thanks in advance:)

Answer 1

It seems you declared the destuctor ~trial(); , but you did not define that.

To define the destructor inside the class declaration, use {} instead of ; like ~trial(){} .

To define the destructor outside the class declaration (inside a source file), write like this:

trial::~trial() {
    // do what you want
}