Description

The $if statement syntax allows for a missing command

$if condition  true_line

or
$if condition
true_line

This is not allowed with $ifthen or $elseif. We cannot skip the next line
if we have no true_line and condition=FALSE.

Contributor: Alex

Small Model of Type : GAMS

Category : GAMS Test library

Main file : ifthen6.gms

$title $ifthen/elseif false without sameline (IFTHEN6,SEQ=478)

$ontext
  The $if statement syntax allows for a missing command

  $if condition  true_line

  or
  $if condition
  true_line

This is not allowed with $ifthen or $elseif. We cannot skip the next line
if we have no true_line and condition=FALSE.

Contributor: Alex
$offtext

$set opt X
$ifthen '%opt%'==u
$elseif '%opt%'==uv
$elseif '%opt%'==ua
$elseif '%opt%'==uav
$elseif '%opt%'==cplex
$else
$error --opt=%opt% but should be u|uv|ua|uav|cplex
$endif
$if errorfree $abort *** skipped input lines
$clearerrors