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From: chu@acsu.buffalo.edu (john c chu)
Newsgroups: comp.lang.c
Subject: Poorly worded question (was Re: IsUnsigned() function?)
Message-ID: <31240@eerie.acsu.Buffalo.EDU>
Date: 22 Jul 90 16:41:05 GMT
References: <17125@haddock.ima.isc.com> <1990Jul20.144241.2560@diku.dk> <3566@sactoh0.UUCP>
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In article <3566@sactoh0.UUCP> jak@sactoh0.UUCP (Jay A. Konigsberg) writes:
>dicovered that the correct answer is the simple one. Namely:

>if ( num < 0 ) return FALSE else return TRUE;

This is essentially Karl Heuer's return(num>=0) (or something to the
effect, sorry) which was considered the trivial solution.

>The question
>is designed to find people who will make things overly complacted
>or just don't know very much about how things work - thats where I
>got traped. I passed by the simple solution because the question
>seemed to imply that it wasn't the best. Oh well, thats why I read
>this group.
>
>In fact, the systems programmer liked the question so much, he said
>he was going to include it in his interviews in the future.

The question seems designed to find people who will mis-read questions
to find the easy way out. :-)

Seriously, there are at least 3 valid interpretations of that question.

The question originally stated that they wanted a function to return a
0 if an integer is signed or a 1 if it is unsigned.

Interpretation 1: return a 0 if the integer is of type int, return a 1
if it is of unsigned int (this can only be done by macro, right?)

Interpretation 2: return a 0 if the integer is less than zero, else
return a 1 (this is what they wanted and has been called the trivial
solution by the net).

Interpretation 3: technically, all numbers are 'signed' (positive or
negative) except 0, so it should return a 0 for all numbers except 0
for which it should return a 1. (e.g. return(num = 0))

I've come up with a new plausible interpretation each time I've read
the original post (they came in the order listed above). IMHO, this
question has too many interpretations to be a good question without
some clarification. (Or perhaps it was intentional, so that they can
find the people who think their way. I personally would have ended up
implementing Interpretation 3.)

					john
				chu@autarch.acsu.buffalo.edu