| // Copyright (c) 2016, 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. |
| |
| // Tests of loops. |
| |
| import 'package:expect/expect.dart'; |
| |
| fact(n) { |
| var f = BigInt.one; |
| while (n > 1) { |
| f *= BigInt.from(n); |
| --n; |
| } |
| return f; |
| } |
| |
| fib(n) { |
| if (n == 0) return 0; |
| var previous = 0, current = 1; |
| while (n > 1) { |
| var temp = current; |
| current += previous; |
| previous = temp; |
| --n; |
| } |
| return current; |
| } |
| |
| mkTrue() => true; |
| mkFalse() => false; |
| |
| check(b) { |
| Expect.isTrue(b); |
| return b; |
| } |
| |
| test0() { |
| while (mkTrue()) { |
| Expect.isTrue(true); |
| return; |
| } |
| Expect.isTrue(false); |
| } |
| |
| test1() { |
| while (mkFalse()) { |
| Expect.isTrue(false); |
| } |
| Expect.isTrue(true); |
| } |
| |
| test2() { |
| do { |
| Expect.isTrue(true); |
| } while (mkFalse()); |
| Expect.isTrue(true); |
| } |
| |
| test3() { |
| do { |
| Expect.isTrue(true); |
| return; |
| } while (check(false)); |
| Expect.isTrue(false); |
| } |
| |
| main() { |
| Expect.isTrue(fact(0) == BigInt.one); |
| Expect.isTrue(fact(1) == BigInt.one); |
| Expect.isTrue(fact(5) == BigInt.from(120)); |
| Expect.isTrue(fact(42) == |
| BigInt.parse("1405006117752879898543142606244511569936384000000000")); |
| Expect.isTrue(fact(3.14159) == BigInt.from(6)); |
| |
| Expect.isTrue(fib(0) == 0); |
| Expect.isTrue(fib(1) == 1); |
| Expect.isTrue(fib(2) == 1); |
| Expect.isTrue(fib(3) == 2); |
| Expect.isTrue(fib(4) == 3); |
| Expect.isTrue(fib(5) == 5); |
| Expect.isTrue(fib(6) == 8); |
| Expect.isTrue(fib(7) == 13); |
| Expect.isTrue(fib(42) == 267914296); |
| Expect.isTrue(fib(3.14159) == 3); |
| |
| test0(); |
| test1(); |
| test2(); |
| test3(); |
| } |