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);
}