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/.