| // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| library math_test; |
| import "package:expect/expect.dart"; |
| import 'dart:math'; |
| import 'package:math/math.dart'; |
| |
| void testPowmod() { |
| Expect.equals(1, powmod(2, 0, 7)); |
| Expect.equals(2, powmod(2, 1, 7)); |
| Expect.equals(4, powmod(2, 2, 7)); |
| Expect.equals(1, powmod(2, 3, 7)); |
| Expect.equals(2, powmod(2, 4, 7)); |
| |
| Expect.equals(1, powmod(2, 0, 13)); |
| Expect.equals(1, powmod(-5, 0, 7)); |
| Expect.equals(1, powmod(2, 0, -9)); |
| |
| // Negative base |
| Expect.equals(1, powmod(-2, 0, 7)); |
| Expect.equals(5, powmod(-2, 1, 7)); |
| Expect.equals(6, powmod(-2, 3, 7)); |
| |
| // Negative power (inverse modulo) |
| Expect.equals(4, powmod(2, -1, 7)); |
| Expect.equals(2, powmod(2, -2, 7)); |
| Expect.equals(1, powmod(2, -3, 7)); |
| |
| // Negative modulus (should behave like % operator) |
| Expect.equals(1, powmod(2, 0, -7)); |
| Expect.equals(2, powmod(2, 1, -7)); |
| Expect.equals(4, powmod(2, 2, -7)); |
| |
| Expect.throws(() => powmod(0, null, 0), (e) => e is ArgumentError); |
| Expect.throws(() => powmod(null, 0, 0), (e) => e is ArgumentError); |
| Expect.throws(() => powmod(0, 0, null), (e) => e is ArgumentError); |
| |
| // Medium int (mint) arguments smaller than 94906266. |
| // 67108879 is the first prime after 2^26. |
| Expect.equals(1048576, powmod(pow(2, 20), 1, 67108879)); |
| Expect.equals(66863119, powmod(pow(2, 20), 2, 67108879)); |
| Expect.equals(57600, powmod(pow(2, 20), 3, 67108879)); |
| Expect.equals(67095379, powmod(pow(2, 20), 4, 67108879)); |
| Expect.equals(4197469, powmod(pow(2, 20), 5, 67108879)); |
| } |
| |
| main() { |
| testPowmod(); |
| } |