NAME

       isfinite - test for finite value

SYNOPSIS

       #include <math.h>

       int isfinite(real-floating x);

DESCRIPTION

       The isfinite() macro shall determine whether its argument has a finite value (zero, subnormal, or normal,
       and  not  infinite  or  NaN).  First, an argument represented in a format wider than its semantic type is
       converted to its semantic type. Then determination is based on the type of the argument.

RETURN VALUE

       The isfinite() macro shall return a non-zero value if and only if its argument has a finite value.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       fpclassify()  ,  isinf()  ,  isnan()  ,  isnormal()  ,  signbit()  ,  the  Base  Definitions  volume   of
       IEEE Std 1003.1-2001 <math.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers,
       Inc and The Open Group. In the event of any discrepancy between this version and the  original  IEEE  and
       The  Open  Group  Standard,  the  original  IEEE and The Open Group Standard is the referee document. The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                                   2003                                           ISFINITE(P)