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[linuxjm/LDP_man-pages.git] / original / man3 / nan.3

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-.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
-.\"
-.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
-.\" Distributed under GPL
-.\" %%%LICENSE_END
-.\"
-.\" Based on glibc infopages
-.\"
-.\" Corrections by aeb
-.\"
-.TH NAN 3 2010-09-20 "GNU" "Linux Programmer's Manual"
-.SH NAME
-nan, nanf, nanl \- return 'Not a Number'
-.SH SYNOPSIS
-.B #include <math.h>
-.sp
-.BI "double nan(const char *" tagp );
-.br
-.BI "float nanf(const char *" tagp );
-.br
-.BI "long double nanl(const char *" tagp );
-.sp
-Link with \fI\-lm\fP.
-.sp
-.in -4n
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.in
-.sp
-.ad l
-.BR nan (),
-.BR nanf (),
-.BR nanl ():
-.RS 4
-_XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
-_POSIX_C_SOURCE\ >=\ 200112L;
-.br
-or
-.I cc\ -std=c99
-.RE
-.ad
-.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.
-.LP
-The call
-.I nan("char-sequence")
-is equivalent to:
-.nf
-
-    strtod("NAN(char-sequence)", NULL);
-.fi
-.PP
-Similarly, calls to
-.BR nanf ()
-and
-.BR nanl ()
-are equivalent to analogous calls to
-.BR strtof (3)
-and
-.BR strtold (3).
-.PP
-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 VERSIONS
-These functions first appeared in glibc in version 2.1.
-.SH CONFORMING TO
-C99, POSIX.1-2001.
-See also IEC 559 and the appendix with
-recommended functions in IEEE 754/IEEE 854.
-.SH SEE ALSO
-.BR isnan (3),
-.BR strtod (3),
-.BR math_error (7)
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.