Rational Developer for System z
Enterprise PL/I for z/OS, Version 3.8, Language Reference Manual

ISNAN

ISNAN returns a '1'B if if the argument with which it is invoked is a NAN. Otherwise it returns a '0'B.

Read syntax diagramSkip visual syntax diagram>>-ISNAN(x)----------------------------------------------------><
 
x
REAL FLOAT DECIMAL expression.

The FLOAT(DFP) compiler option must be in effect.

No floating-point exceptions will be raised no matter what the format of the argument.


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