Re: Boolean expressions

["Booth Martin" <Booth@xxxxxxxxxxxx>]

Something is wrong with my e-mailer?  It didn't send what I typed.  Let me
try again:

  C      If (this
  C         And that
  C         Or (this
  C         And that
  C   do this ....

  C      EndIf


---------------------------------------------------------
Booth Martin http://www.MartinVT.com
Booth@MartinVT.com
---------------------------------------------------------
-------Original Message-------
From: rpg400-l@midrange.com
Date: Thursday, November 15, 2001 01:59:26 PM
To: rpg400-l@midrange.com
Subject: Re: Boolean expressions
Restated, I read your desire this way:
C If (this C And that C Or (this C And that C do this
C EndIf
Unfortunately, the parentheses make all the difference in the world. Your
example can't have parentheses so you end up with a totally left to right
expression. As you already know, a totally left to right expression just
won't do what you want done, so you'd need two if/endif groups in RPG.
One more compelling reason for using RPGIV You already understand RPGIV,
its RPG that is giving you trouble.
btw, in RPG I'd code this way:
C that ifeq 'that'
C this ifeq 'otherthing'
C this oreq 'Thing'
C do this
C EndIf
C Endif
---------------------------------------------------------
Booth Martin http://www.MartinVT.com
Booth@MartinVT.com
---------------------------------------------------------
-------Original Message-------
From: rpg400-l@midrange.com
Date: Thursday, November 15, 2001 01:23:48 PM
To: rpg400-l@midrange.com
Subject: Boolean expressions
Being new to the as400 programming world, I would like some insight of how
RPG deals with expressions such as
this ifeq 'Thing'
that andeq 'That'
this oreq 'Otherthing'
that andeq 'That'
do this
endif
Isn't it redundant and if so equivalent of:
this ifeq 'Thing'
this oreq 'otherthing'
that andeq 'that'
do this
end if
How does RPG evaluate boolean expressions?
I've had some argumentation about this and do not agree with my superior on
this.
Thanks in advance.
Francois Cinq
______________________________________________