Inheritance_demo

Inheritance

#include <iostream>

class Base {
private:
	int b;
protected:
	int c;
public:
	Base() :a(5), b(6), c(7) {}
	int a;
};


class Derived1 : Base { //private Inheritance
public:
	void printValues() {
		std::cout << a; //ok
		std::cout << b; //error. 'b' is a private member in Base and therefore inaccesible to Derived1.
		std::cout << c; //ok
	}
};


class Derived2 :protected Base { //protected Inheritance
public:
	void printValues() {
		std::cout << a; //ok
		std::cout << b; //error. 'b' is a private member in Base and therefore inaccesible to Derived2.
		std::cout << c; //ok
	}
};

class Derived3 :public Base { //public Inheritance
public:
	void printValues() {
		std::cout << a; //ok
		std::cout << b; //error. 'b' is a private member in Base and therefore inaccesible to Derived3.
		std::cout << c; //ok
	}
};


int main(int argc, char *argv[]) {
	
	Derived1 d1;
	std::cout << d1.a;  //error. 'a' is a private member in Derived1
	std::cout << d1.c;  //error. 'c' is a private member in Derived1


	Derived2 d2;
	std::cout << d2.a;  //error. 'a' is a protected member in Derived2
	std::cout << d2.c;  //error. 'c' is a protected member in Derived2

	Derived3 d3;
	std::cout << d3.a;  //ok. 'a' is a public member in Derived3
	std::cout << d3.c;  //error. 'c' is a protected member in Derived3

	return 0;
}