In a recent note, "Shmuel Metz (Seymour J.)" said:
> Date: Mon, 3 Oct 2005 17:13:06 -0300
>
> > /* IF LINE = JLIN & TY_FL /= 'Y' THEN CALL TYPRUN */
>
> Is that even legal REXX?
>
> >(I hadn't realized "/=" is an acceptable form;
>
> AFAIK it isn't. Of course, even if it is valid you are correct that
> mixing forms makes the code harder to read.
>
in:
Title: z/OS V1R7.0 TSO/E REXX Reference
Document Number: SA22-7790-06
..., and all the way back to OS/390 1.4:
2.2.2 Operators
2.2.2.3 Comparison
\=, ¬=, /=
\<, ¬<
\>, ¬>
\==, ¬==, /==
\<<, ¬<<
\>>, ¬>>
So, for whatever mysterious reason (lexical ambiguity?),
only two of the six relops allow negation with '/'.
-- gil
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