isinff(3) [netbsd man page]

ISINFF(3)						   BSD Library Functions Manual 						 ISINFF(3)

NAME

     isinff, isnanf -- test for infinity or not-a-number

LIBRARY

     Math Library (libm, -lm)

SYNOPSIS

     #include <math.h>

     int
     isinff(float);

     int
     isnanf(float);

DESCRIPTION

     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.

BUGS

     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

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 infinity, 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 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/.

								    2013-07-22								 FINITE(3)