Help with Classes and database arrays

brookeville · #1 12-Apr-2005, 19:13

Hello all,

I am in the process of designing a program (a savings account database program) and I have run into a few subtle errors I need to resolve. The whole program consists of 2 header files, 2 source code files (each with member function definitions) and 1 driver file. I have only listed one header file and a simple member function. I am having specific trouble completing this one member function.

Here is the class header file:

CPP / C++ / C Code:

// SavingsDB.h

#ifndef SAVINGS_DB_H
#define SAVINGS_DB_H

#include "SavingsAccount.h"

class SavingsDB {
public:
	SavingsDB(); // default ctor
	enum { MAX_DB = 10 }; // enumerated constant
	void addAccount();
	void deleteAccount();
	void displayAccount();
	void updateAccountBalances();
	void printDb();
	void dBmenu();
	void openDbFile();
	void saveDbFile();

private:
	SavingsAccount db[MAX_DB]; // database array
	int size;
};
#endif

First off, in the private section, I do not understand the declaration of the database array, SavingsAccount db[MAX_DB]. I presume it is an object of class SavingsAccount?

Here is my member function definition:

CPP / C++ / C Code:

///////////////////////////////////////////////////////////////////////////////////////////////
// The function prompts the user to enter account data and then stores the data in a record in 
// the database array. If the database is full an appropriate message is displayed. 
///////////////////////////////////////////////////////////////////////////////////////////////
void SavingsDB::addAccount()
{

	unsigned acctNo;
	float balance;
	static int i;
	i = 0;

	if (size == 10)
	{
		cout << "Database is full. Cannot add a new savings account." << endl;
		dBmenu(); //return to menu
	}
	
	cout << "Enter a New Savings Account\n";
	
	cout << "Enter Account #: ";
	cin >> acctNo;

	cout << "Enter Balance: ";
	cin >> balance;

	db[i] = acctNo;
	db[i + 1] = balance;

	i += 2; // add two to static variable i for next use of this function

	dBmenu();
	

}

What I need to do is store each account number and balance entered in a record in the database array. (Later, the array will be output to a text file). I am having trouble doing this... the array was not assigned a specific type in the header file I believe. Any help is most appreciated.

brookeville · #2 13-Apr-2005, 00:26

Let me also post the SavingsAccount header file, if it helps solve some of my other problems w/ this assignment:

CPP / C++ / C Code:

// SavingsAccount.h

#ifndef SAVINGS_ACCOUNT_H
#define SAVINGS_ACCOUNT_H

#include <iostream>

using namespace std; //instead of using std::ostream

class SavingsAccount 
{

friend ostream& operator <<(ostream & os, SavingsAccount& sa); // use with cout

public:
	
	SavingsAccount() //constructor
		: accountNumber(0), savingsBalance(0.0f) //member initializers
	{

	//empty body
	
	} 
	
	void setAccountNumber( unsigned acctNo );
	void setBalance( float balance );
	void updateAccountBalance();
	unsigned getAccountNumber() const;
	float getBalance() const;
	bool operator==( SavingsAccount & rhs );
	static void setInterestRate( float );
	static float getInterestRate();	

private:
	
	unsigned accountNumber;
	float savingsBalance;
	static float annualInterestRate;
};

#endif

So, basically, I need to be able to enter an (unsigned int) account number and a (float) balance amount; then I need to store this data in a record in the database array. I am getting errors in my previous post, above this one and I don't know how to work them out. Any guidance would be cherished! :-P

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