RE: Having both if/else executing at the same time

Then how would using an elseif change any outcome?  I thought IF, ELSE, 
IF, ELSE, ENDIF is exactly the same as IF, ELSEIF, ELSE, ENDIF.
Am I wrong?

Ron Power
Programmer
Information Services
City Of St. John's, NL
P.O. Box 908
St. John's, NL
A1C 5M2
709-576-8132
rpower@xxxxxxxxxx
http://www.stjohns.ca/
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"Joe Pluta" <joepluta@xxxxxxxxxxxxxxxxx> 
Sent by: rpg400-l-bounces@xxxxxxxxxxxx
2006/05/25 04:23 PM
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RPG programming on the AS400 / iSeries <rpg400-l@xxxxxxxxxxxx>


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Subject
RE: Having both if/else executing at the same time






Actually, the original code simply selected among three mutually exclusive
conditions.  Using an ELSEIF doesn't change the outcome at all.

IF CondA;
  DoA;
ELSE;
  IF CondB;
    DoB;
  ELSE;
    DoC;
  ENDIF;
ENDIF;

Is functionally equivalent to:

IF CondA;
  DoA;
ELSEIF CondB;
  DoB;
ELSE;
  DoC;
ENDIF;

The ELSEIF just removes the second "endif" (which you accidentally left in
your post, Bob, LOL!).  This is also functionally equivalent to:

SELECT;
  WHEN CondA;
    DoA;
  WHEN CondB;
    DoB;
  OTHER;
    DoC;
ENDSL;

Nowadays I tend towards the third form if there are more than two mutually
exclusive conditions.

It should be noted that the three conditions being selected among are
(CondA), ((NOT CondA) and (CondB)), and finally ((NOT CondA) and (NOT
CondB)).  That is, even if both CondA and CondB are true, only the first
branch of the code will be executed.

Joe


> From: Bob Cozzi
> 
> ELSE and IF are two statements. In your code the only time the second IF
> will be
> performed is when the first IF fails. Why? Because the first ELSE is 
only
> going
> to be run if the first IF fails. Otherwise it'll jump to the ENDIF
> statements.
> I think what you really mean to have is ELSEIF not "ELSE" and "IF".
> Replace the ELSE and IF with ELSEIF, and then take a look as this page:
> 
> www.rpgiv.com/blueribbon.html
> 
>   if %len(%trim(APIErrMsg)) > 0;
>      W#ERFL = *ON;
>      W#MSDT = 'Error #' + APIErrMsg + ' receiving data from ' +
>               'data queue.  Detail:  ' + APIErrDta;
>    elseif %trim(itmInfo) = '';
>       W#ERFL = *ON;
>       W#MSDT = 'Invalid data received from data queue: ' +
>             itmInfo ;
>    else;
>        uMATNO = jMATNO;
>        uSIZE = jSIZE;
>        uTEMPER = jTEMPER;
>        uINSUL = jINSUL;
>        uTENSIL = jTENSIL;
>    endif;
>    endif;