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;
}
}