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)