Manpage of FINITE

FINITE

Section: Linux Programmer's Manual (3)
Updated: 2016-03-15
Index
 

NAME

finite, finitef, finitel, isinf, isinff, isinfl, isnan, isnanf, isnanl - BSD floating-point classification functions  

SYNOPSIS

#include <math.h>int finite(double x);
int finitef(float x);
int finitel(long double x);int isinf(double x);
int isinff(float x);
int isinfl(long double x);int isnan(double x);
int isnanf(float x);
int isnanl(long double x);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

finite(), finitef(), finitel():

/* Glibc since 2.19: */ _DEFAULT_SOURCE
    || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
isinf():
_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE
    || /* Glibc since 2.19: */ _DEFAULT_SOURCE
    || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

isinff(), isinfl():
/* Glibc since 2.19: */ _DEFAULT_SOURCE
    || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
isnan():
_XOPEN_SOURCE || _ISOC99_SOURCE
    || /* Glibc since 2.19: */ _DEFAULT_SOURCE
    || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
isnanf(), isnanl():
_XOPEN_SOURCE >= 600
    || /* Glibc since 2.19: */ _DEFAULT_SOURCE
    || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
 

DESCRIPTION

The finite(), finitef(), and finitel() functions return a nonzero value if xis neither infinite nor a "not-a-number" (NaN) value, and 0 otherwise.

The isnan(), isnanf(), and isnanl() functions return a nonzero value if xis a NaN value, and 0 otherwise.

The isinf(), isinff(), and isinfl() functions return 1 if xis positive infinity, -1 if xis negative infinity, and 0 otherwise.  

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
finite(), finitef(), finitel(),
isinf(), isinff(), isinfl(),
isnan(), isnanf(), isnanl()
Thread safetyMT-Safe
 

NOTES

Note that these functions are obsolete. C99 defines macros isfinite(), isinf(), and isnan() (for all types) replacing them. Further note that the C99 isinf() has weaker guarantees on the return value. See fpclassify(3).  

SEE ALSO

fpclassify(3)


 

Index

NAME
SYNOPSIS
DESCRIPTION
ATTRIBUTES
NOTES
SEE ALSO

This document was created by man2html, using the manual pages.
Time: 22:27:51 GMT, June 20, 2016