NAN(3P) POSIX Programmer's Manual NAN(3P)PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the corresponding
Linux manual page for details of Linux behavior), or the interface may
not be implemented on Linux.
nan, nanf, nanl - return quiet NaN
double nan(const char *tagp);
float nanf(const char *tagp);
long double nanl(const char *tagp);
The function call nan("n-char-sequence") shall be equivalent to:
strtod("NAN(n-char-sequence)", (char **) NULL);
The function call nan("") shall be equivalent to:
strtod("NAN()", (char **) NULL)
If tagp does not point to an n- char sequence or an empty string, the
function call shall be equivalent to:
strtod("NAN", (char **) NULL)
Function calls to nanf() and nanl() are equivalent to the corresponding
function calls to strtof() and strtold().
These functions shall return a quiet NaN, if available, with content
indicated through tagp.
If the implementation does not support quiet NaNs, these functions
shall return zero.
No errors are defined.
The following sections are informative.
SEE ALSOstrtod(), strtold(), the Base Definitions volume of
IEEE Std 1003.1-2001, <math.h>
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online
at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 NAN(3P)