c++: Difference between member and non member functions

Question

What is the difference between member and non-member functions in C++?

Answer 1

In the following code, f() is a member function of class Sample, and g() is a non-member function:

class Sample
{
  void f();
};

void g();

Its very simple. Since f() is a member of the class Sample, so its called member function (of class Sample). And since g() is not member of any class, so its called non-member function.