// Name: msglm
// Date: 
// Program Name:
// Description: 


#include <iostream>
#include <string>
#include <iomanip>
using namespace std;

int main() {

	//Variable declaration
	int num;
	
	//Almost opted for a unsigned long long, but the imprecision with using values too high was too great. Floating point precision is king in this regard.
	double output;
	char again;
	bool repeat = true;

	//Program title and description for the user
	cout << "Title: Find Factorial" << endl << "Description: Given a non-zero number, print its factorial" << endl;

	while(repeat) {
	// User input
	cout << "Input the non-negative integar you'd like to find the factorial of: ";
	cin >> num;

	// Calculations
	if (num < 0) {
		cout << "Error! The number you inputted was negative!";
	} else if (num == 0) {
		output = 0;
	} else {
		output = 1;
		for(int i = 1; i <= num; i++) {
			output = i * output;
		}
	}

	// Output to the screen
	cout << "The Factorial of " << num << " is " << fixed << setprecision(0) << output << endl;

	//Go Again
	cout << "This program supports running again, would you like to run again? (y/n): ";
	cin >> again;
	if (again == 'y' || again == 'Y') {
		repeat = true;
		cout << "\033[2J\033[1;1H";

	} else {
		repeat = false;
	}

	}
	return 0;
}

/*This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
 */