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


int main()
{
	
	cout << "Please enter the starting principal and then press RETURN. ";
	double principal {0.00};
	cin >> principal;


	if (!cin) { 
		cerr<< "Sorry, that wasn't an acceptable number.\n";
	        return EXIT_FAILURE;
	}
	if (principal <= 0){
		cerr << " Sorry, the prinicipal must be positive.\n";
		return EXIT_FAILURE;
	}

        cout <<"For how many years? ";
	int nyears {0};
	cin >> nyears;

	if (!cin) {
		 cerr << "Sorry that wasn't a number.\n";
		 return EXIT_FAILURE;
	}

	if (nyears <=0) {
		 cerr << "Sorry, the number of years must be positive.\n";
		 return EXIT_FAILURE;
	}

	cout << "What is the annual interest rate in percent (e.g., 6)? ";
	double rate {0.00};
	cin >> rate;

	if (!cin) {
		cerr << "Sorry, that wasn't a number.\n";
		return EXIT_FAILURE;
	}
	if (rate <=0) {
		cerr << "Sorry, the interest rate must be positive.\n";
		return EXIT_FAILURE;
	}

	 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;
}	

	//Also make sure the rate is a reasonable(e.g. positive) number.
	//Each year, multiply the principal by the following factor.
	//For example, if rate is 6, the factor will be 1.06 double factor rate {1.00+01* rate};