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-'\" t
-.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
-.\"
-.\" SPDX-License-Identifier: GPL-1.0-or-later
-.\"
-.\" Based on glibc infopages
-.\"
-.\" Corrections by aeb
-.\"
-.TH nan 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-nan, nanf, nanl \- return 'Not a Number'
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.P
-.BI "double nan(const char *" tagp );
-.BI "float nanf(const char *" tagp );
-.BI "long double nanl(const char *" tagp );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR nan (),
-.BR nanf (),
-.BR nanl ():
-.nf
-    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
-.fi
-.SH DESCRIPTION
-These functions return a representation (determined by
-.IR tagp )
-of a quiet NaN.
-If the implementation does not support
-quiet NaNs, these functions return zero.
-.P
-The call
-.I nan("char\-sequence")
-is equivalent to:
-.P
-.in +4n
-.EX
-strtod("NAN(char\-sequence)", NULL);
-.EE
-.in
-.P
-Similarly, calls to
-.BR nanf ()
-and
-.BR nanl ()
-are equivalent to analogous calls to
-.BR strtof (3)
-and
-.BR strtold (3).
-.P
-The argument
-.I tagp
-is used in an unspecified manner.
-On IEEE 754 systems, there are many representations of NaN, and
-.I tagp
-selects one.
-On other systems it may do nothing.
-.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 nan (),
-.BR nanf (),
-.BR nanl ()
-T}	Thread safety	MT-Safe locale
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.P
-See also IEC 559 and the appendix with
-recommended functions in IEEE 754/IEEE 854.
-.SH HISTORY
-glibc 2.1.
-C99, POSIX.1-2001.
-.SH SEE ALSO
-.BR isnan (3),
-.BR strtod (3),
-.BR math_error (7)