PAL CARD CATALOG ENTRY

SHORT DESCRIPTION

An exact decimal model for arithmetic with Ada


MOVEMENT WITHIN THE PAL CARD CATALOG
Move to top-level taxonomy
Move to keyword list

ASSET PROFILE

UNIT NAME
ADAR
VERSION
1.0
REVIEW CODE
AR; C1 1.0 A
INET ADDRESS
Not documented in PAL database
AUTHOR
Benjamin M. Brosgol
David Emery
Robert Eachus
RIGHTS
Approved for public release; distribution unlimited
COPYRIGHT
1993 The MITRE Corporation
DATE CREATED
15 Jan 93
DATE RELEASED
12 Nov 93
DATE LAST UPDATED
12 Nov 93
LOCATION
ASSET
PAL
AdaNET
ENVIRONMENT
Not documented in PAL database
LIMITATIONS
Not documented in PAL database
CERTIFICATION
Ada System Certifier_1 1.0
Date/Time of Processing: Tuesday   24 May       1994 06:06:24Pm
Overall Assessment of System: OK
Classification of System: A
Basis of Classification --
Syntax Errors                               PASS
Completeness                                PASS
Independence from External Libraries        PASS
Independence from a Specific Ada Compiler   PASS

Number of ...
Files              93
Library Units      94
Lines           11344
Statements       4728
Comments         1730

Subunits and Parent Units --
5 parent program units
0 missing parent units
15 subunits
0 subunits found but not specified
0 subunits specified but not found

FILE LISTING

Directory Display


languages/ada/swcomps/adar:
  File Name                 Size
  ---------                 ----
  README                   1,666
  adar.sda                 7,686
  adar.sdf               114,749
  adar.zip               140,512


Totals
  ==============  ==============
    4 Files              264,613

ABSTRACT

ASSET_A_347:  Ada Decimal Arithmethic and Representations
     Among the application domains for which Ada is being used or is
under consideration, is the traditional COBOL domain of business data
processing. However, Ada's arithmetic type facility does not readily
handle the exact decimal model needed for financial computation, leaving
a major impediment to a successful transition to Ada for Information
Systems applications. The ADAR project addresses this shortcoming by
providing a set of packages that define and implement decimal support in
Ada 83.  The ADAR packages include support for decimal data with up to
18 digits of precision, arithmetic operations with programmer control
over rounding versus truncation, conversions to and from common external
representations, and formatted output of decimal values based on COBOL's
"picture" clauses.  The ADAR packages offer a portable interface via a
set of unit specifications, and a portable (although not necessarily
efficient) reference implementation.
     ADAR provides two approaches to decimal arithmetic: one through a
discriminated private type, where discriminants establish precision (the
number of digits) and scale (the number of digits to the right of the
decimal point); and another through generic packages, where the effect
of precision and scale is established via generic instantiation.  For
details on the two approaches, refer to the accompanying report in the
SUMMARY.TXT file.  Users can employ either or both of the approaches in
their programs.
     The design and development of ADAR was conducted by Mr. Robert
Eachus and Mr. David Emery from the MITRE Corporation, and by Dr.
Benjamin Brosgol.


REVISION HISTORY

15 Jan 93   1.0   Brosgol et al   Initial release to ASSET
12 Nov 93   1.0   ASSET           Initial release to the PAL


RELEASE NOTICE

This prologue must be included in all copies of this software.
Restrictions on use or distribution:  NONE


DISCLAIMER

	This software and its documentation are provided "AS IS" and
without any expressed or implied warranties whatsoever.  No warranties
as to performance, merchantability, or fitness for a particular
purpose exist.
	The user is advised to test the software thoroughly before
relying on it.  The user must assume the entire risk and liability of
using this software.  In no event shall any person or organization of
people be held responsible for any direct, indirect, consequential or
inconsequential damages or lost profits.