ILOG OPL Development Studio Language Reference Manual

(condition)?thenExpr : elseExprwhere condition is a ground condition with no decision variable. If condition is true,the condition evaluates to thenExpr ; otherwise, it evaluates to elseExpr.Examplesint value = ...;int signValue = ( value>0 ) ? 1 : ( value=0 ) ? value : -value;See the numeric functions in OPL functions in the Language Quick Reference.Counting expressionsAmong integer expressions, there are also some combinatorial expressions. For example, youcan use the count function to count the number of times a particular value appears in anarray of decision variables. You can use such an expression in modeling constraints only ifthe modeling constraints are part of a model that is solved by the CP Optimizer engine (thatis, starting with the using CP; statement).The constraintcount(x, 2) == 3;states that in the array of variables x, exactly three variables take the value 2.For more information, see count in the Language Quick Reference.I L O G O P L D E V E L O P M E N T S T U D I O L A N G U A G ER E F E R E N C E M A N U A L93