infnan

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Langue: en

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Version: 1993-06-02 (openSuse - 09/10/07)

Section: 3 (Bibliothèques de fonctions)

Sommaire

NAME

infnan - deal with infinite or not-a-number (NaN) result

SYNOPSIS


#include <math.h>



double infnan(int error);

Link with -lm.

DESCRIPTION

The infnan() function returns a suitable value for infinity and "not-a-number" (NaN) results. The value of error can be ERANGE to represent infinity or anything else to represent NaN. errno is also set.

RETURN VALUE

If error is ERANGE (Infinity), HUGE_VAL is returned.

If error is -ERANGE (-Infinity), -HUGE_VAL is returned.

If error is anything else, NAN is returned.

ERRORS

EDOM
The value of error is "not-a-number" (NaN).
ERANGE
The value of error is positive or negative infinity.

CONFORMING TO

4.3BSD

NOTES

This obsolete function was provided in libc4 and libc5, but is not available in glibc2.