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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 .