#include <iostream>
using namespace std;
class Account
{
protected:
    float m_balance;
public:
    Account() {
        m_balance = 0;
    }
    Account(float balance) {
        m_balance = balance;
    }
    float getBalance() {
        return m_balance;
    }
    void Deposit(float money)
    {
        m_balance += money;
    }
    void  withdraw(float money)
    {
        if (money <= m_balance)
            m_balance -= money;
        else {
            cout << "Not enough money to withdraw."<<endl;
        }
    }
};
class SavingAccount :public Account {
private:
    int m_period;
    float m_rate;
    int m_duration;
public:
    
    SavingAccount();
    SavingAccount(int period,float rate,int dur);
    float calcInterest();
    void Deposit(float money);
    void withdraw(float money);
    void DurIncrease();
};
SavingAccount::SavingAccount() {
    m_period = 0;
    m_rate = 0;
    m_duration = 0;
}
SavingAccount::SavingAccount(int period, float rate, int dur) {
    m_period = period;
    m_rate = rate;
    m_duration = dur;
}
float SavingAccount::calcInterest() {
    return m_balance * m_rate;
}
void SavingAccount::Deposit(float money)
{
    this->m_duration = 0;
    return Account::Deposit(money);
}
void SavingAccount::withdraw(float money)
{
    this->m_duration = 0;
    return Account::withdraw(money);
}
void SavingAccount::DurIncrease()
{
    this->m_duration += 1;
}
int main()
{
    SavingAccount S(4, 2.1, 12);
    S.Deposit(100000);
    S.withdraw(120000);
    float money = S.getBalance();
    cout << money << endl;
}