| // 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. |
| |
| // @dart = 2.9 |
| |
| import "package:expect/expect.dart"; |
| |
| swap1(x, y, b) { |
| if (b) { |
| var t = x; |
| x = y; |
| y = t; |
| } |
| Expect.equals(2, x); |
| Expect.equals(1, y); |
| } |
| |
| swap2(x, y, z, w, b) { |
| if (b) { |
| var t = x; |
| x = y; |
| y = t; |
| |
| var q = z; |
| z = w; |
| w = q; |
| } |
| Expect.equals(2, x); |
| Expect.equals(1, y); |
| Expect.equals(4, z); |
| Expect.equals(3, w); |
| } |
| |
| swap3(x, y, z, b) { |
| if (b) { |
| var t = x; |
| x = y; |
| y = z; |
| z = t; |
| } |
| Expect.equals(2, x); |
| Expect.equals(3, y); |
| Expect.equals(1, z); |
| } |
| |
| swap4(x, y, z, b) { |
| if (b) { |
| var t = x; |
| x = y; |
| y = z; // swap cycle involves unused variable 'y' |
| z = t; |
| } |
| Expect.equals(2, x); |
| Expect.equals(1, z); |
| } |
| |
| swap5(x, y, z, w, b, b2) { |
| if (b) { |
| var t = x; |
| x = y; |
| y = t; |
| } |
| if (b2) { |
| var q = z; |
| z = w; |
| w = q; |
| } |
| Expect.equals(2, x); |
| Expect.equals(1, y); |
| Expect.equals(4, z); |
| Expect.equals(3, w); |
| } |
| |
| main() { |
| swap1(1, 2, true); |
| swap1(2, 1, false); |
| |
| swap2(1, 2, 3, 4, true); |
| swap2(2, 1, 4, 3, false); |
| |
| swap3(1, 2, 3, true); |
| swap3(2, 3, 1, false); |
| |
| swap4(1, 2, 3, true); |
| swap4(2, 3, 1, false); |
| |
| swap5(1, 2, 3, 4, true, true); |
| swap5(1, 2, 4, 3, true, false); |
| swap5(2, 1, 3, 4, false, true); |
| swap5(2, 1, 4, 3, false, false); |
| } |