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-'\" t
-.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
-.\"
-.\" SPDX-License-Identifier: GPL-1.0-or-later
-.\"
-.\" This was done with the help of the glibc manual.
-.\"
-.\" 2004-10-31, aeb, corrected
-.TH fpclassify 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-fpclassify, isfinite, isnormal, isnan, isinf \- floating-point
-classification macros
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.P
-.BI "int fpclassify(" x );
-.BI "int isfinite(" x );
-.BI "int isnormal(" x );
-.BI "int isnan(" x );
-.BI "int isinf(" x );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.\" I haven't fully grokked the source to determine the FTM requirements;
-.\" in part, the following has been tested by experiment.
-.BR fpclassify (),
-.BR isfinite (),
-.BR isnormal ():
-.nf
-    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
-.fi
-.P
-.BR isnan ():
-.nf
-    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
-        || _XOPEN_SOURCE
-        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
-        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.P
-.BR isinf ():
-.nf
-    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
-        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
-        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.SH DESCRIPTION
-Floating point numbers can have special values, such as
-infinite or NaN.
-With the macro
-.BI fpclassify( x )
-you can find out what type
-.I x
-is.
-The macro takes any floating-point expression as argument.
-The result is one of the following values:
-.TP 14
-.B FP_NAN
-.I x
-is "Not a Number".
-.TP
-.B FP_INFINITE
-.I x
-is either positive infinity or negative infinity.
-.TP
-.B FP_ZERO
-.I x
-is zero.
-.TP
-.B FP_SUBNORMAL
-.I x
-is too small to be represented in normalized format.
-.TP
-.B FP_NORMAL
-if nothing of the above is correct then it must be a
-normal floating-point number.
-.P
-The other macros provide a short answer to some standard questions.
-.TP 14
-.BI isfinite( x )
-returns a nonzero value if
-.br
-(fpclassify(x) != FP_NAN && fpclassify(x) != FP_INFINITE)
-.TP
-.BI isnormal( x )
-returns a nonzero value if
-(fpclassify(x) == FP_NORMAL)
-.TP
-.BI isnan( x )
-returns a nonzero value if
-(fpclassify(x) == FP_NAN)
-.TP
-.BI isinf( x )
-returns 1 if
-.I x
-is positive infinity, and \-1 if
-.I x
-is negative infinity.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR fpclassify (),
-.BR isfinite (),
-.BR isnormal (),
-.BR isnan (),
-.BR isinf ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, C99.
-.P
-In glibc 2.01 and earlier,
-.BR isinf ()
-returns a nonzero value (actually: 1) if
-.I x
-is positive infinity or negative infinity.
-(This is all that C99 requires.)
-.SH NOTES
-For
-.BR isinf (),
-the standards merely say that the return value is nonzero
-if and only if the argument has an infinite value.
-.SH SEE ALSO
-.BR finite (3),
-.BR INFINITY (3),
-.BR isgreater (3),
-.BR signbit (3)