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#include <iostream>
class A {
public:
virtual void print() { std::cout << "A class." << std::endl; }
};
class B : public A {
public:
virtual void print() {
A::print();
std::cout << "B class." << std::endl;
}
};
int main(){
B obj_b;
A* p = &obj_b;
p->print();
return 0;
}