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    Command:

    nanl

    
    
    

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

    DESCRIPTION

           These functions return a representation (determined by tagp) of a quiet
           NaN.   If  the  implementation does not support quiet NaNs, these func-
           tions 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 sys-
           tems, 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.
    
    
    

    CONFORMING TO

           C99,  POSIX.1-2001.  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 2010-09-20 NAN(3)

    
    
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