I wonder if the following is a bug, or I somehow misunderstood something?



-o dac


instr 3
  ii = int(frac(p1) * 100)
  print ii ; would expect '1' but getting '0'
endin


i 3.01 0 0



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That's not a bug with int but a misconception as to how a float works in 
c which is the underlying representation. 3.01 is represented actually 
as 3.009999999999999787, so when multiplied by 100 it is slightly less 
than 1 and int truncates it to 0. Instead of using int, use round or 
int(frac(p1)*100 + 0.01)

On 30.12.20 11:00, Søren Jakobsen wrote:
> I wonder if the following is a bug, or I somehow misunderstood something?
>
> 
> 
> -o dac
> 
> 
> instr 3
>    ii = int(frac(p1) * 100)
>    print ii ; would expect '1' but getting '0'
> endin
> 
> 
> i 3.01 0 0
> 
> 
>
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>          https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here

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I see, thanks for the info! Maybe this could be added to the documentation:)
Søren

On 12/30/20, Eduardo Moguillansky  wrote:
> That's not a bug with int but a misconception as to how a float works in
> c which is the underlying representation. 3.01 is represented actually
> as 3.009999999999999787, so when multiplied by 100 it is slightly less
> than 1 and int truncates it to 0. Instead of using int, use round or
> int(frac(p1)*100 + 0.01)
>
> On 30.12.20 11:00, Søren Jakobsen wrote:
>> I wonder if the following is a bug, or I somehow misunderstood something?
>>
>> 
>> 
>> -o dac
>> 
>> 
>> instr 3
>>    ii = int(frac(p1) * 100)
>>    print ii ; would expect '1' but getting '0'
>> endin
>> 
>> 
>> i 3.01 0 0
>> 
>> 
>>
>> Csound mailing list
>> Csound@listserv.heanet.ie
>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>> Send bugs reports to
>>          https://github.com/csound/csound/issues
>> Discussions of bugs and features can be posted here
>
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>         https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here
>

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