Protected

#include <iostream>

using namespace std;

class Father //Base class
{
public:
protected:
    int protectedv;
};

class Child : Father //Derived class //Inheriting from other classes lets you use
{                                    //the other class protected members!
public:
    void doSomething();
};

int main()
{
    Child FuckedUpKid;
    FuckedUpKid.doSomething();
}

void Child::doSomething()
{
    protectedv = 13;
    cout << protectedv << endl;
}