LibTest/core/double/round_A01_t01.dart

// Copyright (c) 2011, 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.

/// @assertion abstract int round()
/// Returns the integer closest to this.
/// Rounds away from zero when there is no closest integer:
/// (3.5).round() == 4 and (-3.5).round() == -4.
/// @description Checks the method on a bunch of values.
/// @author pagolubev

import "../../../Utils/expect.dart";

check(int expected, double arg) {
  Expect.equals(expected, arg.round());
  Expect.equals(-expected, (-arg).round());
}

main() {
  check(0, 0.1);

  // min subnormal
  check(0, 4.9406564584124654e-324);

  // min normal
  check(0, 2.2250738585072014e-308);

  // adjacent doubles

  check(0, .4999999999999999);
  check(0, .49999999999999994);
  check(1, .5);
  check(1, .5000000000000001);

  check(1, 0.9999999999999999);
  check(1, 1.0);
  check(1, 1.0000000000000002);
}