Description

As new features are added to the gams system, one may want
to write GAMS code that adjusts to what version it is running
under. The GAMS language processor has an integer version ID,
whereas the GAMS releases are numbered with a string that can
interpreted as a floating point number.

GAMS release     GAMS version
22.7             227            2008-05-08
22.6             149            2007-12-24
22.5             148            2007-04-01
22.4             147            2007-02-14
22.3             146            2006-11-27
22.2             145            2006-04-21
22.1             144            2006-03-15
22.0             143            2005-08-01
....

1. 1995-09-28 the following features were introduced (GAMS version 86):

   $version nnn     will issue a compilation error if nnn is greater than the
                    current GAMS version
   %system.version% will be replace with 'GAMS Rev nnn' where nnn is the
                    current GAMS version
   system.version   can be used on put without %% and ''

2. 2006-04-21 GAMS release 22.2 (GAMS version 145) added the following features:

   %system.GamsVersion%         will be replace with the current GAMS version 'nnn'
   GamsVersion                  is a new function that will return nnn
   $if GamsVersion mmm command  will execute command if the current GAMS version
                                is greater or equal to nnn, this is similar to
                                the $if errorlevel nnn

3. 2007-04-1 GAMS release 22.5 (GAMS version 148) added access to the GAMS release number:

   %system.GamsRelease%  will be replace with the current GAMS release 'mm.n'
   GamsRelease           is a new function that will return mm.n

3. 2013-01-15 GAMS release 24.1 (GAMS version 241) added access to the GAMS release number
   including the maintenance digit:

   %system.GamsReleaseMaint%  will be replace with the current GAMS release 'xx.y.z'

Keywords: GAMS language features, GAMS version ID

Small Model of Type : GAMS

Category : GAMS Model library

Main file : version1.gms

$title How to test for a GAMS version (VERSION1,SEQ=320)

$onText
As new features are added to the gams system, one may want
to write GAMS code that adjusts to what version it is running
under. The GAMS language processor has an integer version ID,
whereas the GAMS releases are numbered with a string that can
interpreted as a floating point number.

GAMS release     GAMS version
22.7             227            2008-05-08
22.6             149            2007-12-24
22.5             148            2007-04-01
22.4             147            2007-02-14
22.3             146            2006-11-27
22.2             145            2006-04-21
22.1             144            2006-03-15
22.0             143            2005-08-01
....

1. 1995-09-28 the following features were introduced (GAMS version 86):

   $version nnn     will issue a compilation error if nnn is greater than the
                    current GAMS version
   %system.version% will be replace with 'GAMS Rev nnn' where nnn is the
                    current GAMS version
   system.version   can be used on put without %% and ''

2. 2006-04-21 GAMS release 22.2 (GAMS version 145) added the following features:

   %system.GamsVersion%         will be replace with the current GAMS version 'nnn'
   GamsVersion                  is a new function that will return nnn
   $if GamsVersion mmm command  will execute command if the current GAMS version
                                is greater or equal to nnn, this is similar to
                                the $if errorlevel nnn

3. 2007-04-1 GAMS release 22.5 (GAMS version 148) added access to the GAMS release number:

   %system.GamsRelease%  will be replace with the current GAMS release 'mm.n'
   GamsRelease           is a new function that will return mm.n

3. 2013-01-15 GAMS release 24.1 (GAMS version 241) added access to the GAMS release number
   including the maintenance digit:

   %system.GamsReleaseMaint%  will be replace with the current GAMS release 'xx.y.z'

Keywords: GAMS language features, GAMS version ID
$offText

$eolCom //

$version   0     // this will always work
$version 999     // this will fail
$if not errorfree $clearError

$if     gamsversion 0   * will never be true
$if not gamsversion 999 * will be true

Scalar ver, rel;
ver = gamsversion;
rel = gamsrelease;
display ver, rel;

abort$(%system.gamsversion% <> gamsversion) 'system error for gamsversion';
abort$(%system.gamsrelease% <> gamsrelease) 'system error for gamsrelease';

File tmp;
put  tmp 'system.version=' system.version
       / 'system.gamsversion=' '%system.gamsversion%'
       / 'system.gamsrelease=' '%system.gamsrelease%'
       / 'system.gamsreleasemaint=' '%system.gamsreleasemaint%'
       / 'gamsversion =' gamsversion
       / 'gamsrelease =' gamsrelease;