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FPCLASSIFY (3) | C library functions | Unix Manual Pages | :man▋
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
HISTORY
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