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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: Need Help Displaying of Infix to postfix conversion
Date: Sun, 21 Aug 2016 15:43:09 -0700
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BartC <bc@freeuk.com> writes:
> On 21/08/2016 10:47, Own IT wrote:
[...]
>> char pop()
>
> Use char pop(void) here. (Otherwise it won't work with some compilers.)

Certainly char pop(void) is preferred to the old-style char pop(), but
any conforming C compiler will accept the older form.

(And of course `void main()` should be `int main(void)`.)

[...]

-- 
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"