test.cpp

int main() {
    string password = "abcde", str;
    DATA student[128];
    int c = 0, idx = 0;
    //第一部分
    while (cout << "Please enter your password:", cin >> str) {
        if (str != password) c++;
        else break;
        if (c == 3) {
            cout << "Wrong password!" << endl;
            return 0;
        }
    }
    //第二部分
    system("cls");

    return 0;
}