nan, nanf, nanl, nand32, nand64, and nand128 Subroutines

Purpose

Return a quiet NaN.

Syntax

#include <math.h>

double nan (tagp)
const char *tagp;

float nanf (tagp)
const char *tagp;

long double nanl (tagp)
const char *tagp;

_Decimal32 nand32(tagp)
const char *tagp;

_Decimal64 nand64(tagp)
const char *tagp;

_Decimal128 nand128(tagp)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 the nanf, nanl, nand32, nand64, and nand128 subroutines are equivalent to the corresponding function calls to the strtof, strtold, strtod32, strtod64, and strtod128 subroutines.

Parameters

Item	Description
tagp	Indicates the content of the quiet NaN.

Return Values

The nan, nanf, nanl, nand32, nand64, and nand128 subroutines return a quiet NaN with content indicated through tagp.