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

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

SYNOPSIS
       #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():
           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

DESCRIPTION
       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 strtold(3).

       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.

VERSIONS
       These functions first appeared in glibc in version 2.1.

ATTRIBUTES
       For an explanation of the terms used in this section, see attributes(7).

       ┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬────────────────┐
       │Interface                                                                                                                      │ Attribute     │ Value          │
       ├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼────────────────┤
       │nan(), nanf(), nanl()                                                                                                          │ Thread safety │ MT-Safe locale │
       └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴────────────────┘

CONFORMING TO
       C99, POSIX.1-2001, POSIX.1-2008.  See also IEC 559 and the appendix with recommended functions in IEEE 754/IEEE 854.

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

GNU                                                                            2021-03-22                                                                         NAN(3)

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