overload question

#include 
using namespace std;

class C1 {
public:
        int a;
public:
        C1(){ 
                a = 2; 
        }
        virtual int getA() {
                return a;
        }
        int f(C1* c) {
                return c->a + c->getA();
        }
};





class C2 : public C1 {
public:
        int a;
public:
        C2(){ 
                a = 3; 
        }
        int getA() {
                return a;
        }
        int f(C2* c) {
                return c->a + c->getA();
        }
};



int main() {

        C1 *c1 = new C1();
        C2 *c2 = new C2();
        C1 *c3 = c2;

        coutf(c1)  endl;
        coutf(c2)  endl;
        coutf(c3)  endl;

//      coutf(c1) endl;//wrong class c2 cannot accept base pointer  
        coutf(c2) endl;
//      coutf(c3) endl;

        coutf(c1) endl;
        coutf(c2) endl;
        coutf(c3) endl;


        delete c1;
        delete c2;

        return 0;
}

The result is:
4
5//because c->a =2 static binding c->getA() virtual function using C2->getA() 3
5

6

4
5
5

without virtual function the result would be

4
4//static binding all point to Base var and func
4

6
4
4
4