nan(3) [opendarwin man page]

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

NAME

     nan -- generate a quiet NaN

SYNOPSIS

     #include <math.h>

     double
     nan(const char *tagp);

     float
     nanf(const char *tagp);

DESCRIPTION

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

BSD
								   July 24, 2003							       BSD

nan(3M) 						  Mathematical Library Functions						   nan(3M)

NAME

       nan, nanf, nanl - return quiet NaN

SYNOPSIS

       c99 [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double nan(const char *tagp);

       float nanf(const char *tagp);

       long double nanl(const char *tagp);

DESCRIPTION

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

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

       The function call nan(" ") is equivalent to:

	 strtod("NAN()", (char **) NULL)

       If tagp does not point to an n-char sequence or an empty string, the function call is equivalent to:

	 strtod("NAN", (char **) NULL)

       Function calls to nanf() and nanl() are equivalent to the corresponding function calls to strtof() and strtold(). See strtod(3C).

RETURN VALUES

       These functions return a quiet NaN.

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       math.h(3HEAD), strtod(3C), attributes(5), standards(5)

SunOS 5.11							    12 Jul 2006 							   nan(3M)