..
  Copyright 1988-2021 Free Software Foundation, Inc.
  This is part of the GCC manual.
  For copying conditions, see the GPL license file

.. _or:

OR --- Bitwise logical OR
*************************

.. index:: OR

.. index:: bitwise logical or

.. index:: logical or, bitwise

.. function:: OR

  Bitwise logical ``OR``.

  :param I:
    The type shall be either a scalar ``INTEGER``
    type or a scalar ``LOGICAL`` type or a boz-literal-constant.

  :param J:
    The type shall be the same as the type of :samp:`{I}` or
    a boz-literal-constant. :samp:`{I}` and :samp:`{J}` shall not both be
    boz-literal-constants.  If either :samp:`{I}` and :samp:`{J}` is a
    boz-literal-constant, then the other argument must be a scalar ``INTEGER``.

  :return:
    The return type is either a scalar ``INTEGER`` or a scalar
    ``LOGICAL``.  If the kind type parameters differ, then the
    smaller kind type is implicitly converted to larger kind, and the 
    return has the larger kind.  A boz-literal-constant is 
    converted to an ``INTEGER`` with the kind type parameter of
    the other argument as-if a call to INT occurred.

  :samp:`{Standard}:`
    GNU extension

  :samp:`{Class}:`
    Function

  :samp:`{Syntax}:`

  .. code-block:: fortran

    RESULT = OR(I, J)

  :samp:`{Example}:`

    .. code-block:: fortran

      PROGRAM test_or
        LOGICAL :: T = .TRUE., F = .FALSE.
        INTEGER :: a, b
        DATA a / Z'F' /, b / Z'3' /

        WRITE (*,*) OR(T, T), OR(T, F), OR(F, T), OR(F, F)
        WRITE (*,*) OR(a, b)
      END PROGRAM

  :samp:`{See also}:`
    Fortran 95 elemental function: 
    IOR