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

PRED

PRED returns a floating-point value that is the biggest representable number smaller than x. It has the base, mode, and precision of x. OVERFLOW will be raised if there is no such number.

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

PRED(TINY(X)) will return zero and will not raise UNDERFLOW.


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