LibTest/math/pow_A11_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 num pow(num x, num exponent)
/// For doubles, pow(x, y) handles edge cases as follows:
/// ...
///  - if [x] is -Infinity or -0.0 and [y] is an odd integer, then the result
///    is -pow(-[x] ,[y]).
/// @description Checks the result when [x] is -Infinity or -0.0 and [y] is an
/// odd integer.
/// @author pagolubev

import "dart:math" as Math;
import "../../Utils/expect.dart";

main() {
  Expect.equals(
      double.negativeInfinity, Math.pow(double.negativeInfinity, 1));
  Expect.equals(
      double.negativeInfinity, Math.pow(double.negativeInfinity, 1.0));
  Expect.equals(
      double.negativeInfinity, Math.pow(double.negativeInfinity, 11));
  Expect.equals(
      double.negativeInfinity, Math.pow(double.negativeInfinity, 11.0));

  Expect.equals(.0, Math.pow(double.negativeInfinity, -1));
  Expect.isTrue(Math.pow(double.negativeInfinity, -1).isNegative);
  Expect.equals(.0, Math.pow(double.negativeInfinity, -1.0));
  Expect.isTrue(Math.pow(double.negativeInfinity, -1.0).isNegative);
  Expect.equals(.0, Math.pow(double.negativeInfinity, -11));
  Expect.isTrue(Math.pow(double.negativeInfinity, -11).isNegative);
  Expect.equals(.0, Math.pow(double.negativeInfinity, -11.0));
  Expect.isTrue(Math.pow(double.negativeInfinity, -11.0).isNegative);

  Expect.equals(.0, Math.pow(-.0, 1));
  Expect.isTrue(Math.pow(-.0, 1).isNegative);
  Expect.equals(.0, Math.pow(-.0, 1.0));
  Expect.isTrue(Math.pow(-.0, 1.0).isNegative);
  Expect.equals(.0, Math.pow(-.0, 11));
  Expect.isTrue(Math.pow(-.0, 11).isNegative);
  Expect.equals(.0, Math.pow(-.0, 11.0));
  Expect.isTrue(Math.pow(-.0, 11.0).isNegative);

  Expect.equals(double.negativeInfinity, Math.pow(-.0, -1));
  Expect.equals(double.negativeInfinity, Math.pow(-.0, -1.0));
  Expect.equals(double.negativeInfinity, Math.pow(-.0, -11));
  Expect.equals(double.negativeInfinity, Math.pow(-.0, -11.0));
}