Please help me to find issue in this code

class Base

{

public:

Base() {};

~Base() {};

};

class Derived : public Base

{

public:

Derived()

{

data = new char[20];

};

~Derived()

{

delete[] data;

};

private:

char * data;

};

int main()

{

Base * obj = new Derived();

delete obj;

return 0;

}