Saving Account

#include <cstring>
#include <iostream>
using namespace std;
class SavingAccount
{
    static int count;
    static double rate;
    double money;

    char date[20];

  public:
    int No;
    SavingAccount();
    SavingAccount(const char *ndate, double nmoney, double nrate);
    ~SavingAccount();
    void change(double newrate);
    void calculate();
    double getMoney() const;
    void display() const;
};

double SavingAccount::rate = 0.05;
int SavingAccount::count = 0;

void SavingAccount::change(double newrate)
{
    rate = newrate;
}

void SavingAccount::display() const
{
    cout << money << endl;
}

double SavingAccount::getMoney() const
{
    return money;
}

void SavingAccount::calculate()
{
    money += money * rate;
}

SavingAccount::SavingAccount()
{
    count++;
    No = count;
    money = 0;
}
SavingAccount::SavingAccount(const char *ndate, double nmoney, double nrate)
{
    count++;
    No = count;
    strcpy(date, ndate);
    money = nmoney;
    rate = nrate;
}

SavingAccount::~SavingAccount()
{
    count--;
}

int main()
{
    char date[20];
    double money, rate;
    cout << "Date money rate: ";
    cin >> date >> money >> rate;
    SavingAccount sa1(date, money, rate);
    SavingAccount sa2(date, money, rate);
    cout << sa1.No << " " << sa2.No << endl;

    sa1.calculate();
    sa1.display();

    cout << "New rate: ";
    cin >> rate;
    sa1.change(rate);

    sa1.calculate();
    sa1.display();

    return 0;
}