INFNAN(3) Linux Programmer's Manual INFNAN(3)

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

SYNOPSIS
       #include 

       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), HUGEVAL is returned.

       If error is -ERANGE (-Infinity), -HUGEVAL 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 3.53 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/.



GNU                               1993-06-02                         INFNAN(3)