main.cpp

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#include <iostream>
#include <string>
using namespace std;
 
 
 
class A
{
public:
    A(string const & name)
        : _ss(name)
    {
    }
 
    string Get_string() const
    {
        return _ss;
    }
 
//private:              // No access from outside this class.
protected:              // Allows access to members by derived classes.
    string _ss;
 
};
 
class B : public A        // IS-A  [derived class]; 'public' allows access to public/protected members/methods of class A
{
public:
    B(string const & name, int b)  // Has-A  [additional property wrt. A]
        : A(name), _b(b)
    {
//        cout << _ss << endl;
    }
 
    //string Get_string() const {return _ss;}  // overload, not needed here
 
    int fkt_B() const
    {
        return _b*_b;   // Has-A  [additional property wrt. A]
    }
 
private:
    int _b;             // Has-A [additional property wrt. A]
};
 
 
 
//------------------------
 
int main()
{
    A v("Freitag");
    cout << v.Get_string() <<  endl;  // A::Get_string
 
    B g("Samstag",7);
 
    cout << g.Get_string() << " ";    // B::Get_string --> A::Get_string
    cout << g.fkt_B() << endl;
 
    return 0;
}