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

The Linux Programming Interface

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 3.32 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)

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