isnormal(3) - NetBSD Manual Pages

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ISNORMAL(3)             NetBSD Library Functions Manual            ISNORMAL(3)


NAME

     isnormal -- test for normal value


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <math.h>

     int
     isnormal(real-floating x);


DESCRIPTION

     The isnormal() macro determines whether its argument x has a normal
     value.  An argument represented in a format wider than its semantic type
     is converted to its semantic type first.  The determination is then based
     on the type of the argument.

   IEEE 754
     It is determined whether the value of x is normal, and neither zero, sub-
     normal, infinite nor NaN.

   VAX
     It is determined whether the value of x is finite, and neither true zero,
     dirty zero nor ROP.


RETURN VALUES

     The isnormal() macro returns a non-zero value if the value of x is
     finite.  Otherwise 0 is returned.


ERRORS

     No errors are defined.


SEE ALSO

     fpclassify(3), isfinite(3), math(3), signbit(3)


STANDARDS

     The isnormal() macro conforms to ISO/IEC 9899:1999 (``ISO C99'').

NetBSD 9.1                     October 29, 2003                     NetBSD 9.1