tests/corelib/double_round_test.dart

// Copyright (c) 2013, 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.

import 'package:expect/expect.dart';
import 'package:expect/variations.dart' as v;

main() {
  Expect.equals(0, 0.0.round());
  Expect.equals(0, double.minPositive.round());
  Expect.equals(0, (2.0 * double.minPositive).round());
  Expect.equals(0, (1.18e-38).round());
  Expect.equals(0, (1.18e-38 * 2).round());
  Expect.equals(1, 0.5.round());
  Expect.equals(1, 0.9999999999999999.round());
  Expect.equals(1, 1.0.round());
  Expect.equals(1, 1.000000000000001.round());
  if (v.jsNumbers) {
    Expect.equals(1.7976931348623157e+308, double.maxFinite.round());
  } else {
    // Split 0x7fffffffffffffff into sum of two web numbers to avoid compilation
    // error.
    Expect.equals(0x7ffffffffffff000 + 0xfff, double.maxFinite.round());
  }
  Expect.equals(0, (-double.minPositive).round());
  Expect.equals(0, (2.0 * -double.minPositive).round());
  Expect.equals(0, (-1.18e-38).round());
  Expect.equals(0, (-1.18e-38 * 2).round());
  Expect.equals(-1, (-0.5).round());
  Expect.equals(-1, (-0.9999999999999999).round());
  Expect.equals(-1, (-1.0).round());
  Expect.equals(-1, (-1.000000000000001).round());
  if (v.jsNumbers) {
    Expect.equals(-1.7976931348623157e+308, (-double.maxFinite).round());
  } else {
    Expect.equals(-9223372036854775808, (-double.maxFinite).round());
  }
  Expect.isTrue(0.0.round() is int);
  Expect.isTrue(double.minPositive.round() is int);
  Expect.isTrue((2.0 * double.minPositive).round() is int);
  Expect.isTrue((1.18e-38).round() is int);
  Expect.isTrue((1.18e-38 * 2).round() is int);
  Expect.isTrue(0.5.round() is int);
  Expect.isTrue(0.9999999999999999.round() is int);
  Expect.isTrue(1.0.round() is int);
  Expect.isTrue(1.000000000000001.round() is int);
  Expect.isTrue(double.maxFinite.round() is int);

  Expect.isTrue((-double.minPositive).round() is int);
  Expect.isTrue((2.0 * -double.minPositive).round() is int);
  Expect.isTrue((-1.18e-38).round() is int);
  Expect.isTrue((-1.18e-38 * 2).round() is int);
  Expect.isTrue((-0.5).round() is int);
  Expect.isTrue((-0.9999999999999999).round() is int);
  Expect.isTrue((-1.0).round() is int);
  Expect.isTrue((-1.000000000000001).round() is int);
  Expect.isTrue((-double.maxFinite).round() is int);
}