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Double to Packed decimal conversion in Mainframe 'C'


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sampaul4u

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Joined: 27 Mar 2010
Posts: 19
Location: folirida

PostPosted: Fri Sep 17, 2010 4:16 pm
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Hi,
Could anyone assist me to write a function in IBM "C" to convert Double value to Packed Decimal format?

Please advise me.

Thanks.
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Bill O'Boyle

CICS Moderator


Joined: 14 Jan 2008
Posts: 2504
Location: Atlanta, Georgia, USA

PostPosted: Fri Sep 17, 2010 4:30 pm
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What do you mean by "Double" value? Is this a doubleword (8-bytes)? Are the field contents binary? Are the field contents display-numeric?

What language is the program that needs to invoke this Function?

More information is needed....

Bill
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sampaul4u

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Joined: 27 Mar 2010
Posts: 19
Location: folirida

PostPosted: Fri Sep 17, 2010 4:45 pm
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I need this in C laguage. Double precision value (Ex 1000.11) needs to be converted to Packed decimal format (that is eaqualent to COBOL COMP-3)


Thanks.

Bill O'Boyle wrote:
What do you mean by "Double" value? Is this a doubleword (8-bytes)? Are the field contents binary? Are the field contents display-numeric?

What language is the program that needs to invoke this Function?

More information is needed....

Bill
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enrico-sorichetti

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Joined: 14 Mar 2007
Posts: 10801
Location: italy

PostPosted: Fri Sep 17, 2010 4:53 pm
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why should we icon_question.gif icon_evil.gif
You did not even care to look at the manuals

start from
publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/Shelves/CBCBS180 ( for example )
and search for DECIMAL and PACKED

after having read the manuals, if there is something not clear, somebody will be glad to help
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Bill O'Boyle

CICS Moderator


Joined: 14 Jan 2008
Posts: 2504
Location: Atlanta, Georgia, USA

PostPosted: Fri Sep 17, 2010 4:57 pm
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Is this a management directive or is this your suggestion to management?

This can be done easily in a "Called" Assembler sub-program, using the "grande" instructions or in COBOL or PL/I for that matter.

Why must it be "C"?

Have you tried "Googling" this?

Bill
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Ian McIntosh

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Joined: 01 Sep 2011
Posts: 1
Location: Canada

PostPosted: Fri Sep 02, 2011 3:02 am
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IBM mainframe C has a family of builtin packed decimal types, equivalent to COBOL COMP-3. The declaration syntax is
_Decimal (total_digits) varname;
or
_Decimal (total_digits, digits_after_decimal_point) varname;
and if you include <decimal.h> you can use decimal instead of _Decimal.

The operations on the decimal types are mostly the same as for other numeric types. Literals end with the suffix "D". Use "%D(total_digits, digits_after_decimal_point)" in printf and scanf.

To convert a double to decimal, just use an assignment statement or a cast.

double d = 123.456;
_Decimal (6,3) dd;
dd = d;
or
dd = (_Decimal(6,3)) d;

For more information, see
publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/CBCLR170/3.3.4?SHELF=CBCBS180&DT=20070601155844

edited to fix a wrong URL
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dick scherrer

Moderator Emeritus


Joined: 23 Nov 2006
Posts: 19245
Location: Inside the Matrix

PostPosted: Fri Sep 02, 2011 10:47 am
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Hello and welcome to the forum,

Thanks for posting this info.

Enjoy your time here and hopefully we will have things you find useful as well icon_smile.gif

d
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