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

//Principal, interest rate, and years are inputted by the user.

int main()
{
	double principal {1000.00};   //start with this many dollars
	
	cout << "What is the principal?\n";
	cin >> principal; //user inputs the starting principal amount

	if (!cin){
		cerr << "Sorry, that is not a valid number.\n";
		return EXIT_FAILURE; //user must input a valid number
	}
	
	int nyears {0};

	cout << "How many years?\n";
	cin >> nyears; //user inputs the number of years

	if (!cin){
                cerr << "Sorry, that is not a valid number.\n";
                return EXIT_FAILURE; //user must input a valid number
        }

	if (nyears < 1){
                cerr << "Sorry, you must input at least 1 year.\n";
                return EXIT_FAILURE; //user must input a positive number
	}	


	double rate;

	cout << "What is the interest rate? Input a whole number for the percent.\n";
	cin >> rate; //user inputs the interest rate

	if (!cin){
                cerr << "Sorry, that is not a valid number.\n";
                return EXIT_FAILURE; //user must input a valid number
        }

	if (rate < 0){
                cerr << "Sorry, you must input a positive number.\n";
                return EXIT_FAILURE; //user must input a positive number
        }


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

	double factor {1.00 + 0.01 * rate}; //converts the interest rate percent to a decimal number

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

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

	return EXIT_SUCCESS;
}