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NAN(3)                   BSD Library Functions Manual                   NAN(3)

NAME
     nan -- generate a quiet NaN

SYNOPSIS
     #include <math.h>

     double
     nan(const char *tagp);

     long double
     nanl(const char *tagp);

     float
     nanf(const char *tagp);

DESCRIPTION
     The nan() functions return a quiet NaN, whose trailing fraction field contains the result of converting
     tagp to an unsigned integer.  If tagp is too large to be contained in the trailing fraction field of
     the NaN, then the least significant bits of the integer represented by tagp are used.

SPECIAL VALUES
     If tagp contains any non-numeric characters, the function returns a NaN whos trailing fraction field is
     zero.

     If tagp is empty, the function returns a NaN whos trailing fraction field is zero.

STANDARDS
     The nan() functions conform to ISO/IEC 9899:2011.

BSD                              July 01, 2008                             BSD