isnormal(3p) - phpMan

ISNORMAL(P)                                                        ISNORMAL(P)



NAME
       isnormal - test for a normal value

SYNOPSIS
       #include <math.h>

       int isnormal(real-floating x);


DESCRIPTION
       The  isnormal() macro shall determine whether its argument value is normal (neither
       zero, subnormal, infinite, nor 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 isnormal() macro shall return a non-zero value if and only if its argument  has
       a normal value.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       fpclassify()  ,  isfinite()  , isinf() , isnan() , 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 .



POSIX                                2003                          ISNORMAL(P)

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