Someone

#include <iostream>
#include <string>

using namespace std;

class A {
public:
	A(){}

	void say_hello(){
		cout << "Hello, I`m A" << endl;
	}
};

class B:A {
public:
	B():A(){}

	void say_hello(){
		cout << "Hello, I`m B" << endl;
	}
};

int main() {
	A obj1;
	B obj2;

	obj1.say_hello();
	obj2.say_hello();

	return 0;
}