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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. The character string tagp is converted to an integer, which is
     clipped to the range 0 to 255, inclusive. This value is used as the NaN code. The NaN code is placed in
     the 8th through 15th most significant bits of the fraction field of the resulting NaN.

SPECIAL VALUES
     If tagp is empty, 0 is used for the NaN code.

STANDARDS
     The nan() functions conform to ISO/IEC 9899:1999(E).

BSD                              July 24, 2003                             BSD