Is it possible for a class to set the value of a variable that it inherited from another class in the parameter of its constructor?

Question

Class A contains the protected int x . Class B extends class A . Now what class B wants to do is set the value of x as a passing argument in its own constructor. When I try to do that, I get the error:

""x" is not a non-static data member or base class of class "B"".

#include <string>
#include <iostream>

class A {
protected:
    int x;
public:
    A()
    {
    }
};

class B : public A {
public:
    B(int x)
        : x(x)
    {

    }
};

int main()
{

}

Answer 1

You can "set" it, but not initialize it, because it has already been initialized when the base class object gets initialized. You can "set" it like this:

B(int x) 
{ 
    this->x = x; // assignment, not initialization
}

It would make more sense for one of A 's constructors to take care of the initialization of A::x :

A(int x) : x(x) {}

and then use that in B :

using A::A; // allows B b{42};