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Programming > C Moderated > Re: return type...
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Re: return types with conditional

by Barry Schwarz <schwarzb@[EMAIL PROTECTED] > Mar 17, 2008 at 03:21 PM

On Sat, 8 Mar 2008 12:21:45 -0600 (CST), Allan Adler
<ara@[EMAIL PROTECTED]
> wrote:

>Suppose the program is:
>main() { fn1(); if (debug == 0) fn2();}
>where fn2() returns int and fn1() returns int*. Since main is implicitly
>being declared as returning int, is there a possible problem here? If
>debug does equal 0, then the last thing to execute is fn2, which returns
>the expected int. If debug does not equal 0, then the last thing to
execute
>is fn1() which returns an unexpected int*.
>
>I am describing a simplification of a piece of code I am reading by
someone
>else.

It doesn't matter what fn1 and fn2 return since you discard their
return values.  Furthermore, there is no return statement in main so
you don't return a proper int from main either.  So yes, there is a
problem.  Your code invokes undefined behavior.  Your compiler should
generate a diagnostic about reaching the end of non-void function
without returning a value.


Remove del for email
-- 
comp.lang.c.moderated - moderation address: clcm@[EMAIL PROTECTED]
 -- you must
have an appropriate newsgroups line in your header for your mail to be
seen,
or the newsgroup name in square brackets in the subject line.  Sorry.
 




 13 Posts in Topic:
return types with conditional
Allan Adler <ara@[EMAI  2008-03-08 12:21:45 
Re: return types with conditional
Keith Thompson <kst-u@  2008-03-17 15:19:07 
Re: return types with conditional
gordonb.v71k9@[EMAIL PROT  2008-03-17 15:19:10 
Re: return types with conditional
=?ISO-8859-1?Q?Hans-Bernh  2008-03-17 15:20:17 
Re: return types with conditional
Jonathan Leffler <jlef  2008-03-17 15:21:09 
Re: return types with conditional
Thomas Richter <thor@[  2008-03-17 15:21:37 
Re: return types with conditional
Francis Glassborow <fr  2008-03-17 15:21:46 
Re: return types with conditional
Jack Klein <jackklein@  2008-03-17 15:21:48 
Re: return types with conditional
Barry Schwarz <schwarz  2008-03-17 15:21:55 
Re: return types with conditional
Andre Poenitz <poenitz  2008-03-17 15:22:28 
Re: return types with conditional
Keith Thompson <kst-u@  2008-03-20 01:09:19 
Re: return types with conditional
Allan Adler <ara@[EMAI  2008-03-20 01:09:46 
Re: return types with conditional
Kenneth Brody <kenbrod  2008-03-20 15:57:19 

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