Question about Bank account c++ with derived classes

[cheongsiwei]

Need some helps here >.<

[code]The project i required to complete :
Create a base class Bank of a bank account with member functions to allow withdrawal, deposit and calculation of balance. Account should have a name, account number and type.

Create derived class Saving of a saving account, which allows overdraft up to $8000 and gives interest of 2% per annum. Create another derived class Current of a current account, which does not allow overdraft and does not give any interest.

Create two objects of the derived classes with initial deposits of $2000 and $5000 each. Demonstrate the use of various member functions for withdrawal, deposit, interest calculation for one month, showing balance and giving warning when the account balance is zero or less.

The display can be as given below (user inputs are in bold):



Account Name: Jacky Chan(in bold)
Account No: 12345(in bold)
Type: Saving
Balance: $6000
Enter positive amount to deposit and negative to withdraw: $1000(in bold)
Balance: $7000
Interest next month: $11.67


The program that i have wrote so far :

#include <iostream>
#include <string>
using namespace std;
class Bank
{
private:
string myname;
int number;
double changes;
double initialbal;
double endingbal;
public:
Bank(string name=" ", int num=0, double c=0, double ibal=0, double ebal=0)
{
myname = name;
number = num;
changes = c;
initialbal = ibal;
endingbal = ebal;
}
void EnterName();
void ShowName(void );
void EnterNumber();
void ShowNumber(void );
void EnterChanges();
void ShowChanges(void );
void EnternComputeInitialBal(double );
void ComputeEndinglBal(double );
};
void Bank::EnterName()
{
cout<<"Please enter your Account Name: ";
getline(cin, myname);
}
void Bank::ShowName()
{
cout<<"\n\nAccount Name: "<<myname<<endl;
}
void Bank::EnterNumber()
{
cout<<"Please enter your Account Number: ";
cin>>number;
}
void Bank::ShowNumber()
{
cout<<"Account No: "<<number<<endl;
}
void Bank::EnterChanges()
{
cout<<"Please enter positive amount to deposit and negative to withdraw: $";
cin>>changes;
}
void Bank::ShowChanges()
{
cout<<"Enter positive amount to deposit and negative to withdraw: $"<<changes<<endl;
}
void Bank::EnternComputeInitialBal(double ibal)
{
cout<<"Enter inital balance : $"<<ibal<<endl;
}
void Bank::ComputeEndinglBal(double ibal)
{
endingbal=ibal+changes;
cout<<"Ending balance : $"<<endingbal<<endl;
}
void main()
{
Bank bank;
bank.EnterName();
bank.EnterNumber();
bank.EnterChanges();
bank.ShowName();
bank.ShowNumber();
cout<<"Type: Saving "<<endl;
bank.EnternComputeInitialBal(6000);
bank.ShowChanges();
bank.ComputeEndinglBal(6000);
cout<<"Interest next month: $11.67"<<endl;
cout<<"\n\n\n ^_^ Thank you for using this program ^_^ "<<endl;
cout<<" Have a nice day "<<endl;
}
[code]
The problem i have is the derived classes "Saving" and "Current" for my program , Any helps will be greatly appreciated. Thanks in advance.

[weaknessforcats]

Do you have a class diagram?

That is, have you designed on paper what your system does.

If not, try some CRC (Class-Responsibility-Client) cards.

CRC cards are 3x5 file cards with the name of the class as the title on the front. Below that, the card is dividded into two columns in labeled Resonsibility and the other named Client.

Your member functions are the class Responsibilities and the Client is what class either procides are receives information from this method.

The back of the card has the names of the class provate data members.

These cards work for programs of about 50 classes or less. Bigger programs require more powerful tools.

If you don't use these cards, at least draw a class diagram on a sheet of paper. The classes should eb represented by rectangles divided into three parts. The top part for thew class name, the middle part for the class methods and the bottom part for the private members. The rectangles are connected to the other rectangles with lines and the lines are labeled with info about what the relationship is.

What I see in your Bank class is much more than a bank. It also has the screen format and the data entry code. None of this should be in the Bankj class. A Bank is a Bank and not a Bank+screen manager+keyboard.

Start with a Bank as a container of accounts.
An account is a container of transactions
A trancaction can be a cash withdrawal, deposit, check.

Good luck.

[cheongsiwei]

Hi weaknessforcats , thanks for the reply . I understand what you trying to said in the reply . Maybe i should rewrite my program >.< I think i messed it up . BTW I still have doubts how can i create the derived classes "Saving" and "Current" for my program. Can show someone show me or explain to me how I can get it work for my program . Thanks in advance