Re: Overflow values

[Vanya Jovic <jovic@xxxxxxxxxxxx>]

Buck,

what is that GOTO :)))))? Oh, wait, rings a bell, Commodore C-64 and these
high school days, BASIC & puberty. 

Seriously, this is a good experimental example, but I think IBM should
give us something better to trick a cycle in the real world.

Best regards,

Vanay Jovic,
Canada


On Tue, 22 Dec 1998, Buck Calabro/commsoft wrote:

> 
> 
> >>While using EVAL for computing numbers, if the 
> >>result of computing gets larger than the result 
> >>field definition, the throws up an error.  Is 
> >>there any way to get around this?  Like say 
> >>truncate (as it does in Move) some EVAL(T)?? :) 
> 
> No.  EVAL will always behave like this, which is 
> probably a good thing, otherwise you are losing 
> precision in your calculated values and don't
> know it!  If you really want to lose data, you'll
> have to stick with ADD/SUB/MULT/DIV.
> 
> >>If I use *PSSR, the program goes to the top of the line 
> >>and I loose all the work that is done till then.
> 
> You can set up calculations in your *PSSR that check for
> the type of error and set a flag.  When you ENDSR *DETC,
> you can check the flag at the top of the detail calcs
> and start processing at the appropriate place. 
> 
> Here's a poor example of what I mean:
> 
> H Debug 
>  
>  * Sample code to demonstrate use of *PSSR directing 
>  * traffic after an error occurs 
>  
>  * Global declarations 
> D ErrFlag         S              1    Inz('N') 
> D ErrAction       S              6    Inz('*DETC ') 
> D CurrRoutine     S             10    Inz 
>  
>  * Test numbers 
> D Positive        S              5S 0 Inz(15) 
> D Negative        S              5S 0 Inz(-15) 
> D Zero            S              5S 0 Inz(0) 
> D PI              S             10S 9 Inz(3.141592654) 
> D Result          S              3S 0 Inz(0) 
>  
>  * Routine names describe where we are in the program 
>  * When an error occurs, we can steer ourselves 
>  * back to the appropriate place in the program 
> D RtnAdd          S             10    Inz('Add       ') 
> D RtnSub          S             10    Inz('Sub       ') 
> D RtnMul          S             10    Inz('Mul       ') 
> D RtnDiv          S             10    Inz('Div       ') 
>  
> D                SDS 
> D  PGNAME           *PROC 
> D  STATUS           *STATUS 
> D  TMNAME               244    253 
> D  USRNAM               254    263 
> D  JOBNBR               264    269  0 
>  
>  * Mainline.  This is just simple code to demonstrate 
>  * how we can direct traffic after an error occurs 
>  * The *PSSR traps the error, gets control and then 
>  * returns to this point in the program. 
>  *    *DETC         Tag 
>  * Did an error occur?  If so, recover! 
>  * For example's sake, only test/recover from an error 
>  * in the division routine 
>  
> C                   If        ErrFlag='Y' 
> C                   Eval      ErrFlag='N' 
> C                   Select 
> C                   When      CurrRoutine = RtnAdd 
> C                   GoTo      Add 
> C                   When      CurrRoutine = RtnSub 
> C                   GoTo      Sub 
> C                   When      CurrRoutine = RtnMul 
> C                   GoTo      Mul 
> C                   When      CurrRoutine = RtnDiv 
> C                   Eval      Result=0 
> C                   GoTo      PastDiv 
> C                   Other 
> C                   Dump 
> C                   EndSl 
> C                   EndIf 
>  
> C     Add           Tag 
> C                   Eval      CurrRoutine=RtnAdd 
> C                   Eval      Result=Zero+1 
>  
> C     Sub           Tag 
> C                   Eval      CurrRoutine=RtnSub 
> C                   Eval      Result=Zero-1 
>  
> C     Mul           Tag 
> C                   Eval      CurrRoutine=RtnMul 
> C                   Eval      Result=Zero*1 
>  
> C     Div           Tag 
> C                   Eval      CurrRoutine=RtnDiv 
> C                   Eval      Result=PI/Zero 
> C     PastDiv       Tag 
>  
> C                   Eval      *InLR=*On 
>  
>  * An error has occurred 
>  * Set the "Error is happening" flag and return to the mainline
> C     *PSSR         BegSR 
> C                   Eval      ErrFlag='Y' 
> C                   EndSR     ErrAction 
> 
> Buck Calabro
> CommSoft, Albany, NY
> mailto:mcalabro@commsoft.net
> 
> 
> 
> 
> 
> 
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