CPP
cpp
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#include <iostream>
using namespace std;
class A{
public:
virtual void f(){
cout << "a";
}
};
class B: public A{
public :
void f(){
cout << "b";
}
};
class C: public B {
public :
void f(){
cout << "c";
}
};
int main() {
C c;
B *p = &c;
p->f();
c.f();
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