Default constructors variables.

[Drakonaut]

Hi! Let's say I have a class that does not have a constructor. Does the compiler creates a default constructor that initialises my variables to 0 or just an empty constructor?

class Test
{    private:
       int x;
       int y;
    public:
       int z;
};

EDIT:
(a)

Test::Test (){};

OR
(b)

Test::Test ()
{
      int x = 0;
      int y = 0;
    public:
      int z = 0;
};

And is there anything wrong with my understanding here? Like the creation of (b)? By the way, can there be more than 1 constructor for each class? Lastly, does all default constructors take no arguments? Thanks!

[MiiNiPaa]

In short: it is safer to assume that compiler generated constructor does not initialize variables of builtin types.
http://stackoverflow.com/questions/2417065/does-the-default-constructor-initialize-built-in-types