First, that code is highly obfuscated. Why would you ever want to write "IF foo & TRUE" instead of "IF foo"?
Second, "ELSE IF ¬TRUE THEN foo" is dead code. Third, there are no booleans in REXX; the only data type is character string. -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of CM Poncelet <ponce...@bcs.org.uk> Sent: Sunday, September 6, 2020 9:31 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: REXX true/false (was Constant Identifiers) In the following example, TRUE = (1 - 1 = 0 & 1 ¬= 0) [or whatever is more appropriate], it is then sufficient e.g. to code: IF 4 ¬= 6 & TRUE THEN <whatever> ELSE IF ¬TRUE THEN <whatever else> I.e. TRUE can be defined as a Boolean '1'b in REXX, as per above. On 06/09/2020 20:43, Paul Gilmartin wrote: > On Sun, 6 Sep 2020 12:03:18 -0400, scott Ford wrote: > >> I have done things like true =‘Y’ and then >> >> If true >> .......... >> end >> > What language? That would certainly be a syntax error in Rexx. > And why? You could just omit the "if true" and code: > do > .......... > end > > > n Sun, 6 Sep 2020 17:39:48 +0000, Seymour J Metz wrote: >> A simple true=1;false=0 should suffice for clarity. >> > Perhaps not to someone most familiar with shell scripts > where the definitions are nearly the opposite (command > status ($?) = 0 means success or true). > > > On Sun, 6 Sep 2020 17:43:04 +0100, Rupert Reynolds wrote: >> The advantage of Boolean is clarity in something like:- >> /* Rexx */ >> TRUE = (1=1) >> ... >> SELECT >> WHEN logmode = "D4A32782" & (GotASCII & GotVBMrecord) THEN do >> ... > Continuing your example, how would you have set the variables > "GotASCII" and "GotVBMrecord" using the quasi-constants TRUE > and FALSE? Does that enhance either clarity or economy of > expression? > > I'm thinking that something like: > if filetype=='ASCII' then GotASCII = TRUE; else GotASCII = FALSE > would more succinctly be written: > GotASCII = ( filetype=='ASCII' ) > > But I've seen even worse, such as: > if GotASCII = true then ... > rather than simply: > if GotASCII then ... > > > On Sun, 6 Sep 2020 19:28:11 +0000, Seymour J Metz wrote: >> Yes, you can count on the truth values of 0 and 1 in REXX never changing. >> > Only if I spent $60 for the ANSI Standard .pdf > > -- gil > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > . > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
