Problems with Bank account class

Hi everyone,
basically i have some problem in doing my C++ bank account class.I need to create a base class bank with withdrawal,deposit and calculation of balance where there must be a name, account number and type.
i need also to create derived class Saving of a saving account, which allows overdraft up to $8000 and gives interest of 2% per annum and another derived class Current of a current account, which does not allow overdraft and does not give any interest.
Two objects of the derived classes with initial deposits of $2000 and $5000 each. showing interest calculation for one month and and giving warning when the account balance is zero or less.
Now i am stuck with continuing my work.
This is what i have done so far:

Code:

#include <iostream>
#include <iomanip>
#include <string>
using namespace std;

class Bank  {

protected:
	char nm[20];
	int accno;
	float damt,wamt,t,bamt,iamt;   

//amt=amount where d=deposit , w=withdraw, t=total ,b=balance, i=initial(starting amount)

public:
	Bank()
	{iamt=6000;}
	void intro();
	void deposit();
	void withdraw();
	void display();
	void bal();
	void ivalue();
};


void Bank ::intro()
{
	cout<< "\nAccount Name: ";
	cin>>nm;

	cout<< "\nAccount No: ";
	cin>>accno;

	cout<< "\nType: Saving\n ";
}

void Bank::ivalue()
{
	iamt=6000;
}

void Bank ::bal()
{
	cout<<"Balance: $"<<iamt<<endl;

}

void Bank ::withdraw()
{
	cout<<" \nEnter positive amount to deposit and negative to withdraw: $";
	cin>>wamt;

	t=wamt+iamt;

}

void Bank ::display()
{
	if(wamt>t)

	{
		cout<<nm<<setw(10)<<"Not enough balance to be withdrawn\n";

		cout<<"Maximum money can be withdrawn Rs"<<t<<"\n";
	}

	else

	{
		cout<<"Balance:"<<t<<endl;
	}
}


void main()
{
	Bank jacky;

	jacky.intro();
	jacky.bal();
	jacky.withdraw();
	jacky.display();

	Saving john;

	john.showinterest();
	john.sdisplay();
}

Any help will be appreciated thanks.

edit:sorry just added code tags

code tags please.

Start with something like this:

Code:

class Saving: public Bank
{
// code
};

First result on searching Derived class in Firefox address bar: http://www.macs.hw.ac.uk/~alison/ds98/node23.html

I have problems with my bank account too. I think it's missing a few digits.


Quzah.

>>float damt,wamt,t,bamt,iamt;

Don't know about your bank, but mine doesn't have that many "amts."

You should have stated what you need help with - We shouldn't have to read
your code to see where you got stuck (sometimes we like things spelled out).

This might just be me, but I don't think that member functions should involve
cout - I like to pass any data that a member might need to it from main/some
other function - class members aren't like other (global) functions - they should
only have what is needed to manipulate the data in the class. Also, since I
assume that this is a beginners C++ assignment, it might make sense to have
some members that return information about the status of the bank account -
your display member does it, but there's the whole cout thing I mentioned -
also main can't access that value - it would be better to return the balance
instead IMO. Also, why does your constructor and your ivalue function do the
same thing?

Lastly, see my sig on using void main - it's bold and I won't be your friend if you
use it