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(7) for descriptions of the following attributes:


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

SEE ALSO

strtod(3C), math.h(3HEAD), attributes(7), standards(7)

SunOS 5.11 July 12, 2006 NAN(3M)