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 ALSOmath.h(3HEAD), strtod(3C), attributes(5), standards(5)SunOS 5.11 12 Jul 2006 nan(3M)
