LibTest/core/double/toStringAsPrecision_A01_t05.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 String toStringAsPrecision(int precision)
 * @description  Checks the method on a set of values.
 * @author msyabro
 */
import "../../../Utils/expect.dart";

check(String expected, double val, int digits) {
  Expect.equals(expected, val.toStringAsPrecision(digits));
  Expect.equals('-$expected', (-val).toStringAsPrecision(digits));
}

main() {
  check('1', 1.0, 1);
  check('1.0', 1.0, 2);
  check('1.00', 1.0, 3);
  check('1.000', 1.0, 4);
  check('1.0000', 1.0, 5);

  check('0.1', 0.123456, 1); //shouldn't here be 1e-1?
  check('0.12', 0.123456, 2);
  check('0.123', 0.123456, 3);
  check('0.1235', 0.123456, 4);
  check('0.12346', 0.123456, 5);

  check('9e-14', 0.00000000000009, 1);
  check('9.0e-14', 0.00000000000009, 2);
  check('9.00e-14', 0.00000000000009, 3);
  check('9.000e-14', 0.00000000000009, 4);
  check('9.0000e-14', 0.00000000000009, 5);

  check('3', 2.999999999, 1);
  check('3.0', 2.999999999, 2);
  check('3.00', 2.999999999, 3);
  check('3.000', 2.999999999, 4);
  check('3.0000', 2.999999999, 5);

  check('1e+2', 111.1111111, 1);
  check('1.1e+2', 111.1111111, 2);
  check('111', 111.1111111, 3);
  check('111.1', 111.1111111, 4);
  check('111.11', 111.1111111, 5);
}