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CentOS 7.0 - man page for isnanl (centos section 3)

FINITE(3)				      Linux Programmer's Manual 				    FINITE(3)

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(): _BSD_SOURCE || _SVID_SOURCE isinf(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99 isinff(), isinfl(): _BSD_SOURCE || _SVID_SOURCE isnan(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE || _ISOC99_SOURCE; or cc -std=c99 isnanf(), isnanl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600
DESCRIPTION
The finite(), finitef(), and finitel() functions return a nonzero value if x is neither infinite nor a "not-a- number" (NaN) value, and 0 otherwise. The isnan(), isnanf(), and isnanl() functions return a nonzero value if x is a NaN value, and 0 otherwise. The isinf(), isinff(), and isinfl() functions return 1 if x is positive infinity, -1 if x is negative infin- ity, and 0 otherwise.
ATTRIBUTES
Multithreading (see pthreads(7)) The finite(), finitef(), finitel(), isinf(), isinff(), isinfl(), isnan(), isnanf(), and isnanl() functions are thread-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 fpclas- sify(3).
SEE ALSO
fpclassify(3)
COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and informa- tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. 2013-07-22 FINITE(3)


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