ISINFF(3) BSD Library Functions Manual ISINFF(3)NAME
isinff, isnanf -- test for infinity or not-a-number
Math Library (libm, -lm)
The isinff() function returns 1 if the number is ``infinity'', otherwise 0.
The isnanf() function returns 1 if the number is ``not-a-number'', otherwise 0.
SEE ALSO isinf(3), isnan(3), math(3)
IEEE Standard for Binary Floating-Point Arithmetic, Std 754-1985, ANSI.
Neither the VAX nor the Tahoe floating point have distinguished values for either infinity or not-a-number. These routines always return 0
on those architectures.
BSD August 16, 1999 BSD
Check Out this Related Man Page
FINITE(3) Linux Programmer's Manual FINITE(3)NAME
finite, finitef, finitel, isinf, isinff, isinfl, isnan, isnanf, isnanl - BSD floating-point classification functions
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
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE;
or cc -std=c99
_BSD_SOURCE || _SVID_SOURCE
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE || _ISOC99_SOURCE;
or cc -std=c99
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600
The finite(), finitef(), and finitel() functions return a nonzero value if x is neither infinite nor a "not-a-number" (NaN) value, and 0
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 infinity, and 0 otherwise.
Multithreading (see pthreads(7))
The finite(), finitef(), finitel(), isinf(), isinff(), isinfl(), isnan(), isnanf(), and isnanl() functions are thread-safe.
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)COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
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