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NAN(3)				    Linux Programmer's Manual				   NAN(3)

       nan, nanf, nanl - return 'Not a Number'

       #include <math.h>

       double nan(const char *tagp);
       float nanf(const char *tagp);
       long double nanl(const char *tagp);

       Link with -lm.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       nan(), nanf(), nanl():
	   _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
	   or cc -std=c99

       These  functions  return  a  representation  (determined  by tagp) of a quiet NaN.  If the
       implementation does not support quiet NaNs, these functions return zero.

       The call nan("char-sequence") is equivalent to:

	   strtod("NAN(char-sequence)", NULL);

       Similarly, calls to nanf() and nanl() are equivalent to analogous calls to  strtof(3)  and

       The  argument  tagp is used in an unspecified manner.  On IEEE 754 systems, there are many
       representations of NaN, and tagp selects one.  On other systems it may do nothing.

       These functions first appeared in glibc in version 2.1.

       C99, POSIX.1-2001.  See also IEC 559 and the appendix with recommended functions  in  IEEE
       754/IEEE 854.

       isnan(3), strtod(3), math_error(7)

       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

GNU					    2010-09-20					   NAN(3)
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