/* Name:   save.cpp
   Date:   9/27/07
   Author: Frank McCown

This program calculates the amount of money saved
given the monthly deposit, APR, and number of
years.  The deposit is added at the beginning of
the month.  Interest is compounded monthly.

Sample Run:

Enter monthly deposit: 250
Enter APR: 7
Enter number of years: 5

Year     Total
   1   3116.22
   2   6457.71
   3  10040.76
   4  13882.82
   5  18002.63
*/

#include <iostream>
#include <iomanip>      // For setw
using namespace std;

const int MONTHS_PER_YEAR = 12;

void main()
{
	int years, month, total_months;
	double total, deposit, apr, mpr;

	// Get initial values
	cout << "Enter monthly deposit: ";
	cin >> deposit;
	cout << "Enter APR: ";
	cin >> apr;
	cout << "Enter number of years: ";
	cin >> years;

	// Convert annual percentage rate to monthly
	// (12% APR = 1% MPR)
	mpr = apr / MONTHS_PER_YEAR * 0.01;

	cout << endl << setw(4) << "Year" << setw(10)
		<< "Total" << endl;

	// Round all decimals to 2 places.
	cout.precision(2);

	// Put into normal notation (not scientific)
	// and always show decimal point, even if .00
	cout.setf(ios::fixed | ios::showpoint);

	total_months = years * MONTHS_PER_YEAR;

	// Determine new total for every month
	month = 1;
	total = 0;
	while (month <= total_months)
	{
		total += (total + deposit) * mpr + deposit;

		// Only output yearly values, not monthly
		if (month % MONTHS_PER_YEAR == 0)
			cout << setw(4) << month / MONTHS_PER_YEAR
			<< setw(10) << total << endl;

		month++;
	}
}