/*
 Write the program as a procedural C++ program. Calculate 
 and display the mortgage payment amount using the amount 
 of the mortgage, the term of the mortgage, and the interest 
 rate of the mortgage as input by the user. Allow the user to 
 loop back and enter new data or quit. Insert comments in the
 program to document the program.
 */
 
 
#include <iostream>
#include <cmath>
 
 
using namespace std;
 
int main () {
 
	double principle = 0;
	double interest = 5.7;
	int term = 30 * 12;
	double total;
	double monthlyInterest = interest * 12;
	bool validNum = false;
 
	cout << "Please enter principle amount: ";
 
	cin >> principle;
 
	cout << "You entered: " << principle << endl << endl;
 
 
 
	while (validNum == false) {
 
		cout << "Please enter a positive number: ";
 
		cin >> principle;
 
		cout << "You entered: " << principle << endl << endl;
 
 
 
		if (principle <= 0) {
 
			cout << "You did not input a correct number"
 
			<< endl;
 
			cout << "Please re-enter the number!" << endl << endl;
 
		}
		else 
			validNum = true;
 
 
 
	}
 
	cout << "Enter desired Interest Rate: " << endl;
	cin >> interest;
 
	while (validNum == false) {
 
		cout << "Please enter a positive number: ";
 
		cin >> interest;
 
		cout << "You entered: " << interest << endl << endl;
 
 
 
		if (interest <= 0) {
 
			cout << "You did not input a correct number"
 
			<< endl;
 
			cout << "Please re-enter the number!" << endl << endl;
 
		}
		else 
			validNum = true;
 
 
 
	}
 
 
	//cout << "Thank you for entering a valid number!" << endl;
 
	total = (principle * monthlyInterest)/(1-pow(1 + monthlyInterest, -term));
 
 
	cout << "Your priniple is " << principle << endl;
	cout << "Your Interste rate is: " << interest << endl;
	cout << "Term Length: " << term << " Months" << endl;
	cout << "Your total monthly payment is: " << total << endl;
 
 
    return 0;
 
}