Re: return types with conditional

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.


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