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 4.04 of  the  Linux  man-pages  project.   A  description  of  the  project,
       information   about   reporting   bugs,   and   the  latest  version  of  this  page,  can  be  found  at
       http://www.kernel.org/doc/man-pages/.

GNU                                                1993-06-02                                          INFNAN(3)