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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: [Solved] Need some help getting to my feet
Date: Fri, 27 Apr 2018 13:47:19 -0700
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Dan Purgert <dan@djph.net> writes:
> Keith Thompson wrote:
[...]
>> I think some examples in K&R2 use "implicit int", and as I recall that's
>> addressed in the errata.  Always declare and define functions with an
>> explicit return type.
>
> So far I haven't run across that, but I'm only in chapter 1 still.
> Working through slow / rereading the sections a few times so that it
> sticks.  

You might have run across it without realizing it.  The very first
example in K&R2 section 1.1 (I'm using the Kindle edition) is:

    #include <stdio.h>
    
    main()
    {
        printf("hello, world\n");
    }

The "main()" line is an old-style non-prototype (`main()` should be
`main(void)`) *and* it relies on the obsolete "implicit int" rule
(it should be preceded with `int`):

    int main(void)

I don't want to imply that this is a huge deal.  It's really fairly
trivial, and most C compilers will accept the older form without
complaint, or at worst with a warning.  But you should get into the
habit of using the modern form in your own code.

-- 
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"