#include <iostream>
#include <iomanip>   //for the "i/o manipulators" setw and setprecision
#include <cstdlib>
using namespace std;

//Interest is 6% annually.

int main()
{	
	int nyears {0};
	cout << "How many years? ";
	cin >> nyears;
	
	if (!cin) {
		cerr << "Bad input\n";
		return EXIT_FAILURE;
	}
	
	if (nyears <= 0) {
		cerr << "The number of years must be positive.\n";
		return EXIT_FAILURE;
	}

	double principal {0.00};   //start with this many dollars
	cout << "Starting with what principal? ";
	cin >> principal;

	if (!cin) {
		cerr << "Bad input\n";
		return EXIT_FAILURE;
	}

	if (principal <= 0) {
		cerr << "Please provide a positive value.\n";
		return EXIT_FAILURE;
	}
	
	double rate {0.00};   //this is the annual rate
	cout << "What is the annual rate in percent (e.g, 5)? ";
	cin >> rate;

	if (!cin) {
		cerr << "Could not perform input.\n";
		return EXIT_FAILURE;
	}

	if (rate <=0) {
		cerr << "The interest rate must be positive.\n";
		return EXIT_FAILURE;
	}
	
	//Each year, multiply the principal by the factor.
	
	const double factor {1.00 + .01 * rate};

	cout << "year  principal\n"   //column headings
             << "----  ---------\n";

	for (int year {1}; year <= nyears; ++year) {
		principal *= factor;   //means principal = principal * factor

		cout << "  " << setw(2) << year << "   $"
			<< fixed << setprecision(2) << principal << "\n";
	}

	return EXIT_SUCCESS;
}