If you have a constructor without arguments it will be called before the derived class constructor gets executed.
If you want to call a base-constructor with arguments you have to explicitly write that in the derived constructor like this:
class base{ public: base (int arg) { }};class derived : public base{ public: derived () : base (number) { }};You cannot construct a derived class without calling the parents constructor in C++. That either happens automatically if it's a non-arg C'tor, it happens if you call the derived constructor directly as shown above or your code won't compile.
