Language/Statements/While/execution_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 Execution of a while statement of the form while (e) s; proceeds
/// as follows:
///   The expression e is evaluated to an object o. Then, o is subjected to
/// boolean conversion, producing an object r. If r is true, then the statement
/// {s} is executed and then the while statement is re-executed recursively.
/// If r is false, execution of the while statement is complete.
/// @description Checks that the number of iterations is correct for various
/// valid expressions.
/// @author vasya

import '../../../Utils/expect.dart';

main() {
  var count = 0;
  while (false) {
    ++count;
  }
  Expect.equals(0, count);

  count = 0;
  while (true) {
    ++count;
    if (count == 7)
      break;
  }
  Expect.equals(7, count);

  count = 0;
  while (count < 2) {
    ++count;
  }
  Expect.equals(2, count);

  count = 0;
  var it = [0,1].iterator;
  while (it.moveNext()) {
//    it.current;
    ++count;
  }
  Expect.equals(2, count);

  count = 0;
  while (++count < 3) {  }
  Expect.equals(3, count);
}