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)