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/.