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From: dxf <dxforth@gmail.com>
Newsgroups: comp.lang.forth
Subject: Re: Number parsing with checks
Date: Sun, 13 Oct 2024 13:59:55 +1100
Organization: i2pn2 (i2pn.org)
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On 13/10/2024 1:20 pm, Ruvim wrote:
> On 2024-10-13 05:13, dxf wrote:
>> On 13/10/2024 12:54 am, Ruvim wrote:
>>> On 2024-10-12 05:45, dxf wrote:
>>>> The basics:
>>>>
>>>> : .BAD ( -- )  cr ." Invalid item"  .abort ;
>>>>
>>>> : ZE? ( x -- )  if .bad then ;     \ abort if non-zero
>>>> : NZ? ( x -- )  0= ze? ;           \ abort if zero
>>>
>>> Typically, if word name ends with a question mark, the first (top) output parameter of the word is a *flag*. And it's true for all standard words. (though, opposite is not true)
>>
>> It's rather similar.
>>
>> ZE? NZ?  destructively tests TOS
> 
> But these words do not return a flag in the first output parameter. So, their names violate the common convention.

Conventions are a guide.  Thankfully they're not yet a law.