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Path: ...!3.eu.feeder.erje.net!feeder.erje.net!weretis.net!feeder8.news.weretis.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Ruvim <ruvim.pinka@gmail.com> Newsgroups: comp.lang.forth Subject: Re: Number parsing with checks Date: Sun, 13 Oct 2024 06:20:55 +0400 Organization: A noiseless patient Spider Lines: 38 Message-ID: <vefaq8$gn8u$1@dont-email.me> References: <636c943eae41d9a5832ce5a94414cb81be04a44f@i2pn2.org> <vedv35$6b05$1@dont-email.me> <59b4fdfd0718fbe6e37c645925b7bf0b5ac86dde@i2pn2.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Sun, 13 Oct 2024 04:20:57 +0200 (CEST) Injection-Info: dont-email.me; posting-host="055583f00555671c87854758fc8e0208"; logging-data="548126"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18/fXIngdG39IU5FBJpejsI" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:OOUG6ajbESbZRLCbcOoEUwO6oLE= Content-Language: en-US In-Reply-To: <59b4fdfd0718fbe6e37c645925b7bf0b5ac86dde@i2pn2.org> Bytes: 2279 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. > ?ZE ?NZ non-destructively tests TOS These names follow the common convention. A question mark at the beginning of a name means that the word does something or does nothing depending on certain conditions. Well known nonstandard words: `?stack` `?csp` `?comp` `?exec` Standard words: `?do` `?dup` > > Only difference is test and action are rolled into the one function. > -- Ruvim