Function            iseven - is a number even

  Syntax              #include <mathhk.h>
                      (boolean) iseven(x)

  Prototype in        mathhk.h

  Remarks             iseven checks if x is even (evenly divisible by 2).

                      This function is a macro.

  Return value        returns TRUE if x is even, otherwise FALSE.

  See also            isodd()