[Dev-C++] In constructor parameter list x = null

[Daniel G. <sp...@ho...>]

Can someone explain this to me? It's in a header file for a class 
declaration, for the only constructor of the class.

CPenWidthsDlg(CWnd* pParent = NULL);

It's derived from CDialog so I assume that's got something to do with it. I 
am just confused why the parameter is assigned a NULL value. If I pass in a 
pointer will it just get assigned to NULL? then what's the point? To save me 
from having to assign it to NULL in the constructor body or something?





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