| // Copyright (c) 2017, 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 test program to test operation precedence. |
| |
| // @dart = 2.9 |
| |
| library precedence_test; |
| |
| import "package:expect/expect.dart"; |
| |
| main() { |
| testBang(); |
| testIndexWithPrefixAdd(); |
| testIndexWithPostfixAdd(); |
| testTilde(); |
| testUnaryPrefixWithAdd(); |
| testUnaryPostfixWithAdd(); |
| testUnaryPrefixWithMultiply(); |
| testUnaryPostfixWithMultiply(); |
| } |
| |
| void testBang() { |
| int x = 3; |
| |
| Expect.equals(!true == false, true); |
| Expect.equals(!x.isEven, true); |
| Expect.equals(!(++x).isEven, false); |
| Expect.equals(x, 4); |
| Expect.equals(!(x++).isEven, false); |
| Expect.equals(x, 5); |
| } |
| |
| void testIndexWithPrefixAdd() { |
| var x = <int>[3]; |
| |
| Expect.equals(++x[0] + 3, 7); |
| Expect.equals(x[0], 4); |
| Expect.equals(++x[0] - 3, 2); |
| Expect.equals(x[0], 5); |
| Expect.equals(--x[0] + 4, 8); |
| Expect.equals(x[0], 4); |
| Expect.equals(--x[0] - 4, -1); |
| Expect.equals(x[0], 3); |
| |
| Expect.equals(3 + ++x[0], 7); |
| Expect.equals(x[0], 4); |
| Expect.equals(3 - ++x[0], -2); |
| Expect.equals(x[0], 5); |
| Expect.equals(4 + --x[0], 8); |
| Expect.equals(x[0], 4); |
| Expect.equals(4 - --x[0], 1); |
| Expect.equals(x[0], 3); |
| } |
| |
| void testIndexWithPostfixAdd() { |
| var x = <int>[3]; |
| |
| Expect.equals(x[0]++ + 3, 6); |
| Expect.equals(x[0], 4); |
| Expect.equals(x[0]++ - 3, 1); |
| Expect.equals(x[0], 5); |
| Expect.equals(x[0]-- + 4, 9); |
| Expect.equals(x[0], 4); |
| Expect.equals(x[0]-- - 4, 0); |
| Expect.equals(x[0], 3); |
| |
| Expect.equals(3 + x[0]++, 6); |
| Expect.equals(x[0], 4); |
| Expect.equals(3 - x[0]++, -1); |
| Expect.equals(x[0], 5); |
| Expect.equals(4 + x[0]--, 9); |
| Expect.equals(x[0], 4); |
| Expect.equals(4 - x[0]--, 0); |
| Expect.equals(x[0], 3); |
| } |
| |
| void testTilde() { |
| int x = 3; |
| |
| Expect.equals(~x.sign, ~(x.sign)); |
| Expect.equals(~x + 7, (~3) + 7); |
| |
| Expect.equals(~++x + 7, (~4) + 7); |
| Expect.equals(x, 4); |
| Expect.equals(~x++ + 7, (~4) + 7); |
| Expect.equals(x, 5); |
| |
| Expect.equals(~ --x + 7, (~4) + 7); |
| Expect.equals(x, 4); |
| Expect.equals(~x-- + 7, (~4) + 7); |
| Expect.equals(x, 3); |
| } |
| |
| void testUnaryPrefixWithAdd() { |
| int x = 3; |
| |
| Expect.equals(++x + 3, 7); |
| Expect.equals(x, 4); |
| Expect.equals(++x - 3, 2); |
| Expect.equals(x, 5); |
| Expect.equals(--x + 4, 8); |
| Expect.equals(x, 4); |
| Expect.equals(--x - 4, -1); |
| Expect.equals(x, 3); |
| |
| Expect.equals(3 + ++x, 7); |
| Expect.equals(x, 4); |
| Expect.equals(3 - ++x, -2); |
| Expect.equals(x, 5); |
| Expect.equals(4 + --x, 8); |
| Expect.equals(x, 4); |
| Expect.equals(4 - --x, 1); |
| Expect.equals(x, 3); |
| } |
| |
| void testUnaryPostfixWithAdd() { |
| int x = 3; |
| |
| Expect.equals(x++ + 3, 6); |
| Expect.equals(x, 4); |
| Expect.equals(x++ - 3, 1); |
| Expect.equals(x, 5); |
| Expect.equals(x-- + 4, 9); |
| Expect.equals(x, 4); |
| Expect.equals(x-- - 4, 0); |
| Expect.equals(x, 3); |
| |
| Expect.equals(3 + x++, 6); |
| Expect.equals(x, 4); |
| Expect.equals(3 - x++, -1); |
| Expect.equals(x, 5); |
| Expect.equals(4 + x--, 9); |
| Expect.equals(x, 4); |
| Expect.equals(4 - x--, 0); |
| Expect.equals(x, 3); |
| } |
| |
| void testUnaryPrefixWithMultiply() { |
| int x = 3; |
| |
| Expect.equals(++x * 3, 12); |
| Expect.equals(x, 4); |
| Expect.equals(++x / 5, 1.0); |
| Expect.equals(x, 5); |
| Expect.equals(--x * 3, 12); |
| Expect.equals(x, 4); |
| Expect.equals(--x / 4, 0.75); |
| Expect.equals(x, 3); |
| |
| Expect.equals(3 * ++x, 12); |
| Expect.equals(x, 4); |
| Expect.equals(5 / ++x, 1.0); |
| Expect.equals(x, 5); |
| Expect.equals(3 * --x, 12); |
| Expect.equals(x, 4); |
| Expect.equals(6 / --x, 2.0); |
| Expect.equals(x, 3); |
| } |
| |
| void testUnaryPostfixWithMultiply() { |
| int x = 3; |
| |
| Expect.equals(x++ * 3, 9); |
| Expect.equals(x, 4); |
| Expect.equals(x++ / 4, 1.0); |
| Expect.equals(x, 5); |
| Expect.equals(x-- * 3, 15); |
| Expect.equals(x, 4); |
| Expect.equals(x-- / 4, 1.0); |
| Expect.equals(x, 3); |
| |
| Expect.equals(3 * x++, 9); |
| Expect.equals(x, 4); |
| Expect.equals(3 / x++, 0.75); |
| Expect.equals(x, 5); |
| Expect.equals(4 * x--, 20); |
| Expect.equals(x, 4); |
| Expect.equals(4 / x--, 1.0); |
| Expect.equals(x, 3); |
| } |