A question about classes

[ashleygarrott]

I'v looked at a few examples of code involving classes, but there is one thing i do not understand, and can not find information about

Let me give a simple example;

class A
{
public:
void hello() {cout << "Hello";}
}

class B : public A
{
public:
void hi() {cout << "Hi";}
}

I think I'm missing something but I don't understand what public A is doing behind class B: public A
I mean, what is the use of that? What does it do? Basically, what would that mean and how do I use it? Thanks guys

[cire]

http://www.cplusplus.com/doc/tutorial/inheritance/

[ashleygarrott]

Thank you very much, that helps.