Thread: Classes

Ohhh I don't know about that. Ever heard of a "struct hierarchy"? Neither have I... structures don't facilitate object oriented concepts like inheritance and polymorphism like classes do.

Well, I have to admit I've never tried using a "struct hierarchy" in C++, but if the following code works, then in C++ there's no difference between classes and structs accept for the default access:

Code:

include <iostream>
using namespace std;

struct StructA
{
private:
	int a_number;
public:
	StructA(int num): a_number(num){};
	
	int Get_a()
	{
		return a_number;
	}
	
	virtual void print()
	{
		cout<<"This is a."<<endl;
	}
};

struct StructB: public StructA
{
private:
	double b_number;
public:
	StructB(double num1, int num2 ): StructA(num2)
	{
		b_number = num1;
	}
	
	double Get_b()
	{
		return b_number;
	}
	
	virtual void print()
	{
		cout<<"This is b."<<endl;
	}
};

int main()
{ 
	StructB my_b(5.1, 1);
	
	cout<<my_b.Get_a()<<endl
		<<my_b.Get_b()<<endl;
	
	
	StructA my_a(10);

	StructA* pStructA = &my_a;
	pStructA->print();
	
	pStructA = &my_b;
	pStructA->print();

	return 0;
}