gcc/fortran/doc/gfortran/intrinsic-procedures/or.rst

   1 ..
   2   Copyright 1988-2022 Free Software Foundation, Inc.
   3   This is part of the GCC manual.
   4   For copying conditions, see the copyright.rst file.
   5
   6 .. _or:
   7
   8 OR --- Bitwise logical OR
   9 *************************
  10
  11 .. index:: OR, bitwise logical or, logical or, bitwise
  12
  13 .. function:: OR(I, J)
  14
  15   Bitwise logical ``OR``.
  16
  17   :param I:
  18     The type shall be either a scalar ``INTEGER``
  19     type or a scalar ``LOGICAL`` type or a boz-literal-constant.
  20
  21   :param J:
  22     The type shall be the same as the type of :samp:`{I}` or
  23     a boz-literal-constant. :samp:`{I}` and :samp:`{J}` shall not both be
  24     boz-literal-constants.  If either :samp:`{I}` and :samp:`{J}` is a
  25     boz-literal-constant, then the other argument must be a scalar ``INTEGER``.
  26
  27   :return:
  28     The return type is either a scalar ``INTEGER`` or a scalar
  29     ``LOGICAL``.  If the kind type parameters differ, then the
  30     smaller kind type is implicitly converted to larger kind, and the
  31     return has the larger kind.  A boz-literal-constant is
  32     converted to an ``INTEGER`` with the kind type parameter of
  33     the other argument as-if a call to :ref:`INT` occurred.
  34
  35   Standard:
  36     GNU extension
  37
  38   Class:
  39     Function
  40
  41   Syntax:
  42     .. code-block:: fortran
  43
  44       RESULT = OR(I, J)
  45
  46   Example:
  47     .. code-block:: fortran
  48
  49       PROGRAM test_or
  50         LOGICAL :: T = .TRUE., F = .FALSE.
  51         INTEGER :: a, b
  52         DATA a / Z'F' /, b / Z'3' /
  53
  54         WRITE (*,*) OR(T, T), OR(T, F), OR(F, T), OR(F, F)
  55         WRITE (*,*) OR(a, b)
  56       END PROGRAM
  57
  58   See also:
  59     Fortran 95 elemental function:
  60     :ref:`IOR`