nanl

Syntax

#include <math.h> long double nanl(const char *tagp);

Description

nanl returns a quiet NaN with contents indicated by tagp.

Return Value

The quiet NaN.

If quiet NaNs are not supported, zero is returned. DJGPP supports quiet NaNs.

Portability

ANSI/ISO C

C99; not C89

Example

long double ld = nanl("0x1234");