/**********************************************
 *                                            *
 *                                            *
 *           CSCI 1470, Fall 2005             *
 *           Machine Problem: MP4             *
 *      Purpose: Calculate monthly payment,   *
 *    annual interst, and duration of a loan  *
 **********************************************/


#include <iostream>
#include <cmath>
#include <iomanip>


using namespace std;

int main(void)
{

	//Declare the variables
	double monthlypayment, loanamount, monthlyinterest, annualinterest;
	
	int numbermonths, numberyears;


	//Get data from user with prompt
	cout << "Enter the amount of loan in U.S. dollars:";
	cin >> loanamount;
	cout << endl;

	cout << "Enter the rate of interest per year(nominal rate):";
	cin >> annualinterest;
	cout << endl;

	cout << "Enter the duration of loan in years:";
	cin >> numberyears;
	cout << endl;


	// Calculate the monthly interest and payment
	monthlyinterest = annualinterest/1200;

	numbermonths = numberyears * 12;

	monthlypayment = ( monthlyinterest * loanamount * pow((1 + monthlyinterest),numbermonths) ) / ( pow((1 + monthlyinterest),numbermonths) - 1 );

	
	//Display the results
	cout << "Amount of loan is: $" << loanamount << " (U.S. dollars)" << endl << endl;

	cout << "Rate of interest per year is: " << annualinterest << " (nominal rate expressed as percent)" << endl << endl;

	cout << "The duration of the loan is: " << numberyears << " (years)" << endl << endl;

	cout << "The monthly payment is: $" << setprecision(2) << fixed << monthlypayment << " (rounded to two decimal places)" << endl << endl;


	return 0;


}//end of function main