71 lines
4.4 KiB
Rexx
Executable File
71 lines
4.4 KiB
Rexx
Executable File
#!@OOREXX_SHEBANG_PROGRAM@
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/*----------------------------------------------------------------------------*/
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/* */
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/* Copyright (c) 1995, 2004 IBM Corporation. All rights reserved. */
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/* Copyright (c) 2005-2020 Rexx Language Association. All rights reserved. */
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/* */
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/* This program and the accompanying materials are made available under */
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/* the terms of the Common Public License v1.0 which accompanies this */
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/* distribution. A copy is also available at the following address: */
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/* https://www.oorexx.org/license.html */
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/* */
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/* Redistribution and use in source and binary forms, with or */
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/* without modification, are permitted provided that the following */
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/* conditions are met: */
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/* */
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/* Redistributions of source code must retain the above copyright */
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/* notice, this list of conditions and the following disclaimer. */
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/* Redistributions in binary form must reproduce the above copyright */
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/* notice, this list of conditions and the following disclaimer in */
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/* the documentation and/or other materials provided with the distribution. */
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/* */
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/* Neither the name of Rexx Language Association nor the names */
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/* of its contributors may be used to endorse or promote products */
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/* derived from this software without specific prior written permission. */
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/* */
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/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS */
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/* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT */
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/* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS */
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/* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT */
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/* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
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/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED */
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/* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, */
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/* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY */
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/* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING */
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/* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS */
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/* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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/* */
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/*----------------------------------------------------------------------------*/
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/******************************************************************************/
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/* factor.rex Open Object Rexx Samples */
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/* */
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/* A factorial program. */
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/* */
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/* */
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/* -------------------------------------------------------------------------- */
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/* */
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/* Description: */
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/* This program demonstrates a way to define a factorial class using the */
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/* subclass method and the .methods environment symbol. */
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/******************************************************************************/
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say "Enter a number"
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pull number
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If \datatype(number, '9') then do
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Say 'Invalid whole number' number
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Exit
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end
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factorial_class = .string~subclass("Sample")~~define('FACTORIAL', .methods['FACTORIAL'])
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say number 'factorial is' factorial_class~new(number)~factorial
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Exit
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/* Define the factorial method. Note that this method contains a recursive */
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/* call to itself. */
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::method factorial
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If self <= 1 then return 1
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else do
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t = self~class~new(self - 1)
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Return self * (t~factorial)
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end
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