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Man Pages


Manual Reference Pages  -  ISNAN (3)

NAME

fpclassify, isfinite, isinf, isnan, isnormal - classify a floating-point number

CONTENTS

Library
Synopsis
Description
See Also
Standards
History

LIBRARY


.Lb libm

SYNOPSIS


.In math.h int fpclassify real-floating x int isfinite real-floating x int isinf real-floating x int isnan real-floating x int isnormal real-floating x

DESCRIPTION

The fpclassify macro takes an argument of x and returns one of the following manifest constants.
FP_INFINITE Indicates that x is an infinite number.
FP_NAN Indicates that x is not a number (NaN).
FP_NORMAL Indicates that x is a normalized number.
FP_SUBNORMAL
  Indicates that x is a denormalized number.
FP_ZERO Indicates that x is zero (0 or -0).

The isfinite macro returns a non-zero value if and only if its argument has a finite (zero, subnormal, or normal) value. The isinf, isnan, and isnormal macros return non-zero if and only if x is an infinity, NaN, or a non-zero normalized number, respectively.

The symbol isnanf is provided as an alias to isnan for compatibility, and its use is deprecated. Similarly, finite and finitef are deprecated versions of isfinite.

SEE ALSO

isgreater(3), math(3), signbit(3)

STANDARDS

The fpclassify, isfinite, isinf, isnan, and isnormal macros conform to -isoC-99.

HISTORY

The fpclassify, isfinite, isinf, isnan, and isnormal macros were added in
.Fx 5.1 . BSD 3 introduced isinf and isnan functions, which accepted
.Vt double arguments; these have been superseded by the macros described above.
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