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Re: Need Help Displaying of Infix to postfix conversion

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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 18:17:02 -0700
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BartC <bc@freeuk.com> writes:
> On 21/08/2016 23:43, Keith Thompson wrote:
>> 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.
>
> I thought it went badly wrong when using gcc, with pop(), but I've
> done more tests and it happens with pop(void) too. I get this output
> for '3*4':
>
> 3ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ ....
>
> instead of '34*'. Only when optimised. So there might be a bug either
> in the code, or possibly with gcc.

It's not a gcc bug, it's a bug in the code.  The code accesses
stack[-1].  It's not too surprising that the behavior differs with the
optimization level.

> (BTW you now seem to be posting from two hours in the future instead
> of one...)

Thanks, but again, it's not my machine, and I've done what I can.

-- 
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"

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Thread

Need Help Displaying of Infix to postfix conversion Own IT <beltondavid1@gmail.com> - 2016-08-21 02:47 -0700
  Re: Need Help Displaying of Infix to postfix conversion BartC <bc@freeuk.com> - 2016-08-21 11:17 +0100
    Re: Need Help Displaying of Infix to postfix conversion Keith Thompson <kst-u@mib.org> - 2016-08-21 15:43 -0700
      Re: Need Help Displaying of Infix to postfix conversion BartC <bc@freeuk.com> - 2016-08-21 22:17 +0100
        Re: Need Help Displaying of Infix to postfix conversion Keith Thompson <kst-u@mib.org> - 2016-08-21 18:17 -0700
  Re: Need Help Displaying of Infix to postfix conversion Barry Schwarz <schwarzb@dqel.com> - 2016-08-21 09:42 -0700
    Re: Need Help Displaying of Infix to postfix conversion Siri Cruise <chine.bleu@yahoo.com> - 2016-08-21 11:24 -0700
    Re: Need Help Displaying of Infix to postfix conversion BartC <bc@freeuk.com> - 2016-08-21 23:40 +0100
      Re: Need Help Displaying of Infix to postfix conversion Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-08-22 00:13 +0100
        Re: Need Help Displaying of Infix to postfix conversion BartC <bc@freeuk.com> - 2016-08-22 01:31 +0100
          Re: Need Help Displaying of Infix to postfix conversion David Kleinecke <dkleinecke@gmail.com> - 2016-08-21 20:13 -0700
    Re: Need Help Displaying of Infix to postfix conversion supercat@casperkitty.com - 2016-08-22 09:44 -0700
      Re: Need Help Displaying of Infix to postfix conversion Barry Schwarz <schwarzb@dqel.com> - 2016-08-22 10:18 -0700
        Re: Need Help Displaying of Infix to postfix conversion supercat@casperkitty.com - 2016-08-22 10:27 -0700
          Re: Need Help Displaying of Infix to postfix conversion "Osmium" <r124c4u102@comcast.net> - 2016-08-22 16:05 -0500
        Usenet in general and CLC in particular (Was: Need Help something or other...) gazelle@shell.xmission.com (Kenny McCormack) - 2016-08-25 11:48 +0000

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