//Alec White            		CS1A            		Chapter 5, P. 296, #16//
/*******************************************************************************
 *
 * CALCULATE SAVINGS BALANCE
 * _____________________________________________________________________________
 *
 * This program takes a starting balance of a savings account and the 
 * annual interest rate, and calculates the balance of the account per month
 * after requesting the amount deposited/withdrawn per month and the accrual 
 * of interest. It then displays the results to the user after the given number
 * of months has been calculated.
 * _____________________________________________________________________________
 * INPUT
 *	Annual Interest Rate	: Annual interest rate offered by the bank
 *	Months Open				: Months account has been open
 *	Starting Balance    	: Starting balance of the account
 *	Amount Deposited		: Amount of money deposited from account per month
 *	Amount Withdrawn		: Amount of money withdrawn from account per month
 *
 * OUTPUT
 *	Ending Balace       : Final balance of the account after months open
 *	Total $ Deposited	: Total number of $ deposited into the acct after months
 *	open.
 *	Total $ Withdrawn	: Total number of $ withdrawn from the account after
 *	months open.
 ******************************************************************************/
#include <iostream>
using namespace std;
 
int main() {
float annualInterest;
float monthlyInterest;
float monthlyInterestAmount;
float startingBalance;
float amountWithdrawn;
float monthlyDeposit = 0;
float monthlyWithdrawn = 0;
float currentBalance = 0;
float totalWithdrawn = 0;
float totalDeposited = 0;
float totalInterestEarned = 0;
int monthsOpen;
 
//prompt user for starting balance, annual interest rate, and months open and echo back
cout << "Please enter your starting balance. $";
cin >> startingBalance;
	if (startingBalance < 0){
		cout << "Invalid balance. Please enter positive number." << endl;
	return 0;
	}
cout << startingBalance << endl;
cout << "Please enter the annual interest rate as a decimal (i.e. 10% as .10). ";
cin >> annualInterest;
cout << annualInterest << endl;
cout << "Please enter the amount of months passed since your account was opened. ";
cin >> monthsOpen;
cout << monthsOpen << endl;
 
// cout << "Starting Balance = " << startingBalance << " Annual Interest = " << annualInterest << " Months Open = " << monthsOpen << endl;
 
//calculate monthly interest and set startingBalance
currentBalance = startingBalance;
monthlyInterest = annualInterest / 12;
 
//execute a balance update for monthsOpen months
for (int i = 0; i < monthsOpen; i++){
//prompt user for amount deposited and add it to balance
	cout << "How much money was deposited into the account this month? $";
		cin >> monthlyDeposit;
//echo back to user
	cout << monthlyDeposit << endl;
	currentBalance += monthlyDeposit;
	totalDeposited += monthlyDeposit;
//prompt user for amount withdrawn and subtract from balance
	cout << "How much money was withdrawn from the account this month? $";
		cin >> monthlyWithdrawn;
//echo back to user
	cout << monthlyWithdrawn << endl;
//input validation
			if (monthlyWithdrawn < 0){
				cout << "Error: Amount withdrawn cannot be a negative number. Please enter a positive number. " << endl;
				return 0;
			}
//subtract amount withdrawn from current balance and add monthlyWithdrawn to accumulator
	currentBalance -= monthlyWithdrawn;
	totalWithdrawn += monthlyWithdrawn;
//calculate amount of dollars in interest accrued, add to account balance and add to accumulator
	monthlyInterestAmount = monthlyInterest * currentBalance;
	totalInterestEarned += monthlyInterestAmount;
	currentBalance += monthlyInterestAmount;
//end the program if the balance drops below 0
			if (currentBalance < 0){
				cout << "The bank balance is now negative. Terminating the account. Goodbye! " << endl;
				return 0;
			}
}
 
//display account information to user after monthsOpen months
cout << "Balance information after " << monthsOpen << " months" << endl;
cout << "Ending balance: $" << currentBalance << endl;
cout << "Total amount deposited: $" << totalDeposited << endl;
cout << "Total amount withdrawn: $" << totalWithdrawn << endl;
cout << "Total amount accrued in interest: $" << totalInterestEarned << endl;
 
return 0;
}

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