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man pages section 3: Extended Library Functions, Volume 2

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Updated: Thursday, June 13, 2019
 
 

fpclassify(3M)

Name

fpclassify - classify real floating type

Synopsis

c99 [ flag... ] file... –lm [ library... ]
#include <math.h>

int fpclassify(real-floating x);

Description

The fpclassify() macro classifies its argument value as NaN, infinite, normal, subnormal, or zero. First, an argument represented in a format wider than its semantic type is converted to its semantic type. Then classification is based on the type of the argument.

Return Values

The fpclassify() macro returns the value of the number classification macro appropriate to the value of its argument.

Errors

No errors are defined.

Attributes

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Interface Stability
Committed
Availability
system/library/math
MT-Level
MT-Safe
Standard

See Also

math.h(3HEAD), isnan(3M), isfinite(3M), isinf(3M), isnormal(3M), signbit(3M), attributes(7), standards(7)