[Dev-C++] Errors with C program

[Matthews <dem...@uw...>]

I've been teaching myself C out of a book, and am now putting it into
practice, using Dev-cpp 4.9.0.4 or whatever the second newest release was
(I haven't upgraded yet.)  When trying to compile the attatched program, I
get 3 copies of this error:

"Passing arg 2 to `strncpy' makes integer without pointer cast" (or
something close to it, I can't exactly remember) What is that, and how do I
fix it?  Also (before I got those errors and was able to compile), when I
try to log in inside my program, I get an illegal error that says "FUNK OS
has caused an error in MSVCRT.DLL" and it crashes.  Again, why and how to
fix it?

Along with my program, there is a "userlist.txt" in the same directory that
has "Josh.Lukas.Family." in it.  It's supposed to check for usernames from
this file.  And before anyone asks, I don't understand how to use the debug
program.