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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: Why does 'gcc -Wall' complain about void main() ?
Date: Fri, 01 Nov 2019 10:25:16 -0700
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DFS <nospam@dfs.com> writes:
> gcc 9.1.0 on MSYS2
>
> combinearrays.c:14:6: warning: return type of ‘main’ is not ‘int’ [-Wmain]
>     14 | void main() {
>        |      ^~~~

This newsgroup has an FAQ at <http://www.c-faq.com>.
Section 11 answers your question.

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for Philips Healthcare
void Void(void) { Void(); } /* The recursive call of the void */