format ~@d +0

format ~@d +0

[Kevin Ryde]

ice-9 format ~@d prints positives with a "+" sign, but 0 is printed
without one.  I think this is contrary to CL, and it's not what ice-9
format does on floats with ~@f.

Although the code "(> number 0)" looks like no + on 0 is sort of
deliberate it seems to me a mistake that would be worth correcting.


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Re: format ~@d +0

[Marius Vollmer]

Kevin Ryde <user42@zip.com.au> writes:

> ice-9 format ~@d prints positives with a "+" sign, but 0 is printed
> without one.  I think this is contrary to CL, and it's not what ice-9
> format does on floats with ~@f.

What is the sign of zero? ;) IEEE zeros do have a sign, so we should
print them.

> Although the code "(> number 0)" looks like no + on 0 is sort of
> deliberate it seems to me a mistake that would be worth correcting.

The Hyperspec isn't clear about this either, but Clisp prints
"+0"... hmmm.  The docs say that the sign is always printed, and the
canonical sign of zero is +, so we should print a "+".

Please make that change, then!


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