/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is JavaScript Engine testing utilities. * * The Initial Developer of the Original Code is * Mozilla Foundation. * Portions created by the Initial Developer are Copyright (C) 2007 * the Initial Developer. All Rights Reserved. * * Contributor(s): Brendan Eich * * Alternatively, the contents of this file may be used under the terms of * either the GNU General Public License Version 2 or later (the "GPL"), or * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ var gTestfile = 'regress-363040-02.js'; //----------------------------------------------------------------------------- var BUGNUMBER = 363040; var summary = 'Array.prototype.reduce application in continued fraction'; var actual = ''; var expect = ''; //----------------------------------------------------------------------------- test(); //----------------------------------------------------------------------------- function test() { enterFunc ('test'); printBugNumber(BUGNUMBER); printStatus (summary); // Print x as a continued fraction in compact abbreviated notation and return // the convergent [n, d] such that x - (n / d) <= epsilon. function contfrac(x, epsilon) { let i = Math.floor(x); let a = [i]; x = x - i; let maxerr = x; while (maxerr > epsilon) { x = 1 / x; i = Math.floor(x); a.push(i); x = x - i; maxerr = x * maxerr / i; } print(uneval(a)); return a.reduceRight(function (x, y) {return [x[0] * y + x[1], x[0]];}, [1, 0]); } if (!Array.prototype.reduceRight) { print('Test skipped. Array.prototype.reduceRight not implemented'); } else { // Show contfrac in action on some interesting numbers. for each (num in [Math.PI, Math.sqrt(2), 1 / (Math.sqrt(Math.E) - 1)]) { print('Continued fractions for', num); for each (eps in [1e-2, 1e-3, 1e-5, 1e-7, 1e-10]) { let frac = contfrac(num, eps); let est = frac[0] / frac[1]; let err = num - est; print(uneval(frac), est, err); } print(); } } reportCompare(expect, actual, summary); exitFunc ('test'); }