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Groups > comp.lang.c > #387520
| From | Tim Rentsch <tr.17687@z991.linuxsc.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Challenge/exercise problem - signum() function |
| Date | 2024-08-12 09:57 -0700 |
| Organization | A noiseless patient Spider |
| Message-ID | <86jzgl65mv.fsf@linuxsc.com> (permalink) |
| References | (1 earlier) <v8vm2i$2oc1v$2@dont-email.me> <86y152in9n.fsf@linuxsc.com> <v9cpfm$38p3u$2@dont-email.me> <868qx193ew.fsf_-_@linuxsc.com> <v9dc06$3cajf$1@dont-email.me> |
Lew Pitcher <lew.pitcher@digitalfreehold.ca> writes:
> On Mon, 12 Aug 2024 08:17:11 -0700, Tim Rentsch wrote:
>
>> Vir Campestris <vir.campestris@invalid.invalid> writes:
>>
>>> On 12/08/2024 01:43, Tim Rentsch wrote:
>>
>> [...]
>>
>>>> Also, it would be better for your understanding of C if you would
>>>> stop thinking about what is going on at the level of actual
>>>> hardware. Doing that serves to confuse a lot more than it helps.
>>>
>>> I think I feel my ears burning!
>>
>> I'm taking that as a compliment. :)
>>
>> Also as an impetus to post a small C exercise I've been meaning
>> to put up.
>>
>> The goal is to write a C function to compute a signum() value:
>>
>> long
>> signum( long k ){
>> /* should return
>> * -1 if k < 0
>> * +1 if k > 0
>> * 0 otherwise
>> **/
>> /* ... */
>> return 0; /* appropriate return value to be supplied */
>> }
>
> [snip]
>
> Didn't we do something like this a few years ago, when someone
> complained that strcmp() did /not/ return -1, 0, or +1 on
> lessthan, equalto, or greaterthan string comparisons?
Certainly there have been similar exercises, but I don't remember
seeing this exact question. The added restrictions make it more
difficult than it might appear.
> If I still have my "solution" around, I'll post it to followup
> the more current solutions.
Thank you, it would be good to see that.
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Re: how cast works? Vir Campestris <vir.campestris@invalid.invalid> - 2024-08-12 11:51 +0100
Challenge/exercise problem - signum() function Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-12 08:17 -0700
Re: Challenge/exercise problem - signum() function Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2024-08-12 16:07 +0000
Re: Challenge/exercise problem - signum() function Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-08-12 09:57 -0700
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