NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | COLOPHON 

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

NAME         top

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

SYNOPSIS         top

       #include <math.h>
       double infnan(int error);
       Link with -lm.

DESCRIPTION         top

       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         top

       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         top

       EDOM   The value of error is "not-a-number" (NaN).
       ERANGE The value of error is positive infinity or negative infinity.

CONFORMING TO         top

       4.3BSD.

NOTES         top

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

COLOPHON         top

       This page is part of release 4.12 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
       https://www.kernel.org/doc/man-pages/.
GNU                              1993-06-02                        INFNAN(3)