请问大佬们，为什么这段代码存不进去数组里

Question

void oneaccount::showlogin()
{
    int len = 3;
    string cinname;
    string cinpassword1;
    string cinpassword2;
    while (1)
    {
        cout << "请设置您的ID：" << endl;
        cin >> cinname;
        cout << "请设置您的密码：" << endl;
        cin >> cinpassword1;
        cout << "请再次确认您的密码："<<endl;
        cin >> cinpassword2;
        if (cinpassword1 != cinpassword2)
        {
            cout << "前后两次输入密码不一致，请重新设置密码:" << endl;
            continue;
        }
        else if (cinpassword1 == cinpassword2)
        {
            accpass[len]._name = cinname;
            accpass[len]._password = cinpassword1;
            cout << "注册成功！" << endl;
            len++;
            break;
        }
        else
        {
            cout << "出现未知错误！！" << endl;
            break;
        }
    }
}

Answer 1

accpass
在哪里定义的，长度是不是>len+1
否则越界。