nanf(3) [netbsd man page]

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

NAME

     nan, nanf, nanl -- return quiet NaN

LIBRARY

     Math Library (libm, -lm)

SYNOPSIS

     #include <math.h>

     double
     nan(const char *tagp);

     float
     nanf(const char *tagp);

     long double
     nanl(const char *tagp);

DESCRIPTION

     The call nan("n-char-sequence") is equivalent to the call strod("NAN(n-char-sequence)", NULL).  The call nan("") is equivalent to the call
     strod("NAN()", NULL).

     The nanf() and nanl() functions are equivalent to nan() but substituting strtof() and strtold(), respectively.

RETURN VALUES

   IEEE 754
     The nan(), nanf(), and nanl() functions return a quiet NaN as specified by tagp.

   VAX
     The nan(), nanf(), and nanl() functions return zero.

SEE ALSO

     math(3), strtod(3)

STANDARDS

     The nan(), nanf(), and nanl() functions conform to ISO/IEC 9899:1999 (``ISO C99'').

BSD
								  March 15, 2006							       BSD

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

NAME

       nan, nanf, nanl - return quiet NaN

SYNOPSIS

       cc [ 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 5.10							    1 Sep 2002								   nan(3M)