virtual_fn_basic

#include<bits/stdc++.h>
using namespace std;

class base
{
    void f1() { cout << "This is private in base f1()\n"; }
    virtual void f2() { cout << "This is private but virtual in base f2()\n"; }
public:
    virtual void f3() { cout << "This is public virtual in base f3()\n"; }
    virtual void f4() { cout << "This is public virtual in base f4()\n"; }
    void f5() { cout << "This is public in base f5()\n"; }
    virtual void f0() { cout << "This is public virtual in base f0()\n"; }
    virtual ~base(){ cout << "destructor in base\n";}~base(){ cout << "destructor in base\n";}
};

class derived_1 : public base
{
    void f1() { cout << "This is private in derived_1 f1()\n"; }
    void f0() { cout << "This is private in derived_1 f0()\n"; }
public:
    void f3() { cout << "This is public virtual in derived_1 f3()\n"; }
    void f5() { cout << "This is public in derived_1 f5()\n"; }
    ~derived_1(){ cout << "destructor in derived\n";}
};

int main()
{
    base *p = new derived_1();
    //derived_1 d;
    //p = &d;
    p->f3();
    p->f4();
    p->f5();
    p->f0(); /// This is private in derived_1
    delete p;
}