Re: parse a negative number out of a before image string

I hate to beat a dead horse with this topic but never really found a
solution using only RPG... my solution was derived from using SQL, but now
I need an RPG solution only.

So running with Barbara's suggestion...

challenge - extract for a number of bytes, the length of a packed decimal
value (may contain decimals)
objective - convert that clear text value

In my pgm i have the below declaration...


d ds_cvtNumeric ds qualified
d charRep 31
d numRep 31 10 overlay(charRep)
d g_zeros s like(ds_cvtNumeric.charRep)
d inz(*all'0')


my string value that contains the packed value is 5 bytes long
(decimal(9.2)... and obviously in debug it is the reverse image
representation (non clear text).

in debug...

evalr ds_cvtNumeric.charRep = g_zeros +
%trim(%subst(srcString

:1


:i_numOfBytes)); = 5

o_clearTextValue = %char(ds_cvtNumeric.numRep);

this ends up with a data decimal error...

the debug eval shows...

EVAL ds_cvtnumeric
DS_CVTNUMERIC.NUMREP = 000000000000000000000.00000
DS_CVTNUMERIC.CHARREP = '00000000000000000000000000 '


I would really like to put this one to bed.
Any assistance is greatly appreciated.

Jay




On Wed, Oct 30, 2019 at 3:10 PM Barbara Morris <bmorris@xxxxxxxxxx> wrote:

On 2019-10-30 11:51 a.m.,
dlclark@xxxxxxxxxxxxxxxx wrote:

"MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> wrote on 10/30/2019
11:46:31 AM:

You - what Dave says.

You could make the routine more generic if you needed it but this is
the simple way to map a single field.

Yes, for example (to make it more generic), you could create a
15-character field and overlay it with a 15-digit (zero decimal) zoned
field. Then, move zeroes to the zoned field before right justifying the
character data into the character field. Then, you just have to divide
the resulting zoned decimal number (into another field) by the number of
desired decimal places that you got from SYSCOLUMNS.

To get the leading zeros and right-justify the character value in one
go, use EVALR with a character variable initialized to zeros.

dcl-ds cvtzoned qualified;
c char(15);
n zoned(15) overlay(c);
end-ds;
dcl-s zeros like(cvtzoned.c) inz(*all'0');

evalr cvtzoned.c = zeros + '1234N';
dsply (%char(cvtzoned.n));

--
Barbara

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