Encapsulation

private-or-no.cpp

#include <iostream>

class Ax {
public:	
	Ax(int a);
	bool compare(const Ax &other);
	
private:
	int m_a;
};

Ax::Ax(int a) {
	m_a = a;
}

bool Ax::compare(const Ax &other) {
	return m_a == other.m_a;
}

int main() {
	Ax a1(4), a2(5);
	
	std::cout << a2.compare(a1) << std::endl;
}