nanf(3) [mojave 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);

     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

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)