// Oldham, Jeffrey D.
// Modified by:  Massingill, B.
// 1999 Nov 15
// CS 1320

// Bank Account Class and Program

// Megalarge Bank/Insurance/Investment Co, Inc, Ltd. requested us to
// write software for an electronic checkbook to be given to
// customers.  The checkbook should permit the following:
// 1) creation of an account by "depositing" money,
// 2) "depositing money" into the account, and
// 3) writing sequentially numbered checks on the account.

// The checking account should always have a nonnegative balance to
// ensure that Megalarge Bank/Insurance/Investment Co, Inc, Ltd. does
// go into multibillion dollar debt.
// (Another way to say this:  MBIIC is not planning to cover its
// customers' bad checks.)

#include <iostream.h>
#include <iomanip>

// -------- class definition --------

class checkingAcct {
private:  

	// ---- member variables ----

	// We decide to maintain the balance in terms of cents to avoid
	// precision problems.
	unsigned int balance;		// measured in US cents
	unsigned int checkNum;

public:
private:
public:
	// ---- constructor function ----

	// Create an account with the specified balance and initial 
	//check number.
	checkingAcct( const unsigned int initialDollars,
			const unsigned int initialCents,
			const unsigned int beginningCheckNum)  {
		balance = initialDollars * 100 + initialCents;
		checkNum = beginningCheckNum;
	}

	// ---- member functions ----

	// Write a check for the given amount.  The check's number is 
	// returned.  If the check will bounce, an error message is 
	// printed and the returned value is zero.
	unsigned int writeCheck(const unsigned int dollars, 
			const unsigned int cents) {
		if (dollars * 100 + cents > balance) {
			const unsigned int overdrawAmt = 
				dollars * 100 + cents - balance;
			cerr << "Balance is smaller than check amount; "
				<< "the check will bounce!\n";
			cerr << '$' << overdrawAmt / 100 << '.' 
				<< overdrawAmt % 100 
				<< " more needed.\n";
			cerr << "Transaction refused.\n";
			return 0;
		}
		balance -= dollars * 100 + cents;
		++checkNum;
		return checkNum-1;
	}

	// Deposit money in the account.
	void deposit(const unsigned int dollars, const unsigned int cents) {
		const unsigned int increase = dollars * 100 + cents;
		if (increase >= 10000*100)
		cerr << "Federal regulations require reporting your "
			<< "deposit to the U.S. Treasury.\n";
		balance += increase;
		return;
	}

	// Query the balance.
	void queryBalance(unsigned int & dollars, unsigned int & cents) {
		dollars = balance / 100;
		cents = balance % 100;
		return;
	}

	// Print the balance.
	void print(ostream & out) {
		out << '$' << balance / 100 << '.' 
			<< setw(2) << setfill('0') << balance % 100;
		return;
	}

	// ---- destructor function ----

	// When the checking account is being destroyed, warn if the
	// user will lose all the money in the account.
	~checkingAcct(void) {
		if (balance > 0) {
			cerr << "\nYou are losing access to all of "
				<< "your money.\n";
			print(cerr);
			cerr << " will be sent to the "
				<< "president/monarch/dictator of\n";
			cerr << "Megalarge Bank/Insurance/Investment Co, Inc, Ltd.\n";
		}
		return;
	}
};

// -------- main program --------

int main()
{
	checkingAcct Peter(500,0,1001);
	checkingAcct Paul = checkingAcct(250,34, 51);

	cout << "Peter has "; Peter.print(cout); cout << ".\n";
	cout << "Paul has "; Paul.print(cout); cout << ".\n\n";

	cout << "Peter works hard and deposits his paycheck.\n";
	Peter.deposit(123, 23);
	cout << "Peter has "; Peter.print(cout); cout << ".\n\n";

	cout << "Paul spends money here, there, and everywhere.\n";
	cout << "Check numbers:\n";
	cout << "\t" << Paul.writeCheck(73,00) << endl;
	cout << "\t" << Paul.writeCheck(135,59) << endl;
	cout << "\t" << Paul.writeCheck(93,12) << endl;
	cout << "Paul has "; Paul.print(cout); cout << ".\n\n";

	// can we rob Peter to pay Paul?  no; balance is private.
	// (uncomment these lines and try to compile to see what
	// goes wrong.)
	// Peter.balance -= 5138;
	// Paul.balance += 5138;
	// cout << "Robbing Peter to pay Paul.\n";

	cout << "Both Peter and Paul die of natural causes.\n";
	cout << "Peter had "; Peter.print(cout); cout << " unspent.\n";
	cout << "Paul had "; Paul.print(cout); cout << " unspent.\n\n";

	return 0;
}