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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: Program to create csv file and write into it
Date: Sun, 11 Dec 2016 01:12:40 -0800
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Alla _ <modelling.data@gmail.com> writes:
[...]
> (2) no, I don't see any nulls, but I see huge unexpected white spaces in 
> the part I copied from a file with csv extension (as I see not csv yet); 
> I assume these white spaces  = nulls. 

Don't assume that.

A file whose contents you posted here recently did contain a lot of null
characters.  My newsreader displayed them as "^@"; someone else's didn't
show them, or anything following them, at all (it probably treated the
article internally as a null-terminated string).

If you want to examine a file and determine whether it contains null
characters, you need to use some tool that can view binary files and
display their contents in an unambiguous manner.

If you're on a Unix-like system, there are a number of options:
"od", "hexdump"/"hd", "cat -A".  If you're on Windows, there should be
some kind of binary file viewer you can install, or an option in
whatever text editor you're using.

[...]

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"