Re: need help..

Nils Weller wrote:
> CBFalconer wrote:
>
.... snip ...
>>
>> Which you can easily avoid at all times by simply cultivating the
>> habit of writing:
>>
>> if (2 == line) ...
>>
>> i.e. put the constant first.
>
> I don't like this habit for various reasons:
>
> 1) Though the reversed version is semantically equivalent, it is harder
> to read unless you are already quite used to reversing the test. The
> vast majority of programmers always puts the variable they want to test
> first, i.e. they write
>
> if (foo == 0) {
>
> The few who write
>
> if (0 == foo) {
>
.... snip ...
>
> 3) Quality compilers warn about the ``if (foo = 0)'' construct. I know
> for a fact only that gcc and HP's compilers do this (and not because the
> bug ever occured to me, but because I explictly tested these compilers),
> but it is very likely that the offerings of vendors such as Comeau,
> Compaq, Intel, SGI, IBM, Sun and a host of others are also capable of
> doing this (I don't have these compilers handy right now and will let
> others fill in the blanks.)

And I dislike that warning. I often want to write something like:

if (!(p = malloc(sizeof *p))) getoutahere("no memory");
else if (!(p->ptr = malloc(sizeof *p->ptr))) {
free(p); getoutahere("no memory");
}
else {
/* all seems well, go for it */
}
/* Unless getoutahere does something, we always get here */

and similar things to do with opening files, getting parameters,
etc.

--
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.

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