INFNAN

Section: Linux Programmer's Manual (3)
Updated: 1993-06-02
Index Return to Main Contents

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 infinity or negative infinity.

CONFORMING TO

4.3BSD.

NOTES

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

COLOPHON

This page is part of release 3.22 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.