void test1(void)

{

	int number;

	cout << ">> pls input a integer number:";

	while(cin >> number, !cin.eof())

	{

		if(cin.bad()) {

			cout << "stream has corrupted!" << endl;

			return;

		} else if (cin.fail()) {

			cin.clear();

			cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');

			cout << ">> pls input a integer number:";

			continue;

		}

		cout << "number = " << number << endl;

	}

}