ILOG OPL Development Studio Language Reference Manual

Special numbersThere are three special numbers: NaN (Not-A-Number), Infinity (positive infinity), and-Infinity (negative infinity).The special number NaN is used to indicate errors in number manipulations. For example,the square root function Math.sqrt applied to a negative number returns NaN. There is norepresentation of NaN as a number literal, but the global script variable NaN contains its value.The NaN value is contagious, and a numeric operation involving NaN always returns NaN.A comparison operation involving NaN always returns false —even the NaN == NaNcomparison.Examples of NaN:Math.sqrt(-1) NaNMath.sqrt(NaN) NaNNaN + 3 NaNNaN == NaN falseNaN = 3 falseThe special numbers Infinity and -Infinity are used to indicate infinite values and overflowsin arithmetic operations. The global script variable Infinity contains the positive infinity.The negative infinity can be computed using the negation operator (-Infinity.)Examples of Infinity:1/0 Infinity-1/0 -Infinity1/Infinity 0Infinity == InfinitytrueI 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 L213