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

//Interest is 6% annually.

int main()
{
	double rate  {0.0};   //start with this many dollars
	cout << "What is the interest rate?\n";
	cin >> rate;

	if (!cin){ 
		cerr << "That's not a valid value.\n";
		return EXIT_FAILURE;
	}


	double factor {1.00 + .01 * rate};

	double principal {0};

	cout << "How much money are you starting with?\n";
	cin >> principal;

	if (!cin) {
	cerr << "That's not a number!\n";

	return EXIT_FAILURE;
	}

	if (principal <= 0) {
		cerr << "This value is not valid.\n";

		return EXIT_FAILURE;
	}
	int year {0};

	cout << "How many years are we looking at?\n";
	cin >> year;

	if (!cin) {
		cerr << "You can't measure time with that.\n";

		return EXIT_FAILURE;
	}

	if (year <=0) {
		cerr << "That's not a valid number of years.\n";

		return EXIT_FAILURE;
	}


	if (year > 30) {
		cerr << "Reaches maturity at 30 years.\n";

		return EXIT_FAILURE;
	}

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

	for (int year {1}; year <= 30; ++year) {
		principal *= 1.06;   //means principal = principal * 1.06

		cout << setw(4) << year << "   $"
			<< fixed << setprecision(2) << principal << "\n";
	}

	return EXIT_SUCCESS;
}