#include<iostream>
using namespace std;
inline void f1(){cout<<"f1"<<endl;}
inline void f2(){cout<<"f2"<<endl;}
inline void f3(){for(int i=0;i<5;i++){cout<<"f3("<<i<<")"<<endl;}}
inline void f4(){for(int i=4;i>=0;i--){cout<<"f4("<<i<<")"<<endl;}}

class a{
    int a1;
    int a2;
public:
    virtual void dsmth()=0;
};

class b:public a{
    int b1;
public:
    void dsmth(){cout<<"dsmth(b)"<<endl;}
};

class c:public a{
    int c1;
public:
    void dsmth(){cout<<"dsmth(c)"<<endl;}
};

int main(){
    int a=5;
    double qb=static_cast<double>(a)/3;
    cout<<"qb = "<<qb<<endl;
    b ob;
    ob.dsmth();
    c ob1;
    ob1.dsmth();
    f1();
    f2();
    f3();
    f4();
    return 0;
}