/************************************************************************
*Low Monthly payments
*Jason Calcagno
*Input:		principle: amount borrowed (in dollars)
*Output:	monthlyPayment (in dollars and cents)
*AP/IB computer science
*10/6/02
*************************************************************************/

#include <iostream.h>
#include <math.h>
#include <iomanip.h>



double monthlyPayment ( double principle,
                        double annualRate,
                        int numYears       );


void main ()
{
    double principle,     // Amount borrowed (in dollars)
           interestRate;  // Annual interest rate (as a % of 1.0)
    int numYears;         // Length of the loan (in years)

    // Prompt the user and read in the amount borrowed, interest
    // rate, and length of the loan.
    cout << endl << "Enter the amount borrowed: ";
    cin >> principle;
    cout << "Enter the annual interest rate (as a % of 1.0): ";
    cin >> interestRate;
    cout << "Enter the length of the loan (in years): ";
    cin >> numYears;

    // Output the monthly payment.

	cout.setf(ios::fixed, ios::floatfield);
			cout.setf(ios::showpoint);
    cout << setprecision (2);
	cout << "Monthly payment : $ "
         << monthlyPayment(principle,interestRate,numYears) << endl;
}

//--------------------------------------------------------------------
// Insert your monthlyPayment() function here.
//--------------------------------------------------------------------
double monthlyPayment ( double principle,
                        double annualRate,
                        int numYears       )
{

	double months = numYears*12;
	double mpr = annualRate/12;
	double monthlyPayment = mpr*((principle/(1-(1/(pow (1 + mpr, months))))));

	return monthlyPayment;

}

/*

Enter the amount borrowed: 1000
Enter the annual interest rate (as a % of 1.0): .1
Enter the length of the loan (in years): 1
Monthly payment : $ 87.92
Press any key to continue


Enter the amount borrowed: 5000
Enter the annual interest rate (as a % of 1.0): .05
Enter the length of the loan (in years): 2
Monthly payment : $ 219.36
Press any key to continue


Enter the amount borrowed: 10000
Enter the annual interest rate (as a % of 1.0): .089
Enter the length of the loan (in years): 10
Monthly payment : $ 126.14
Press any key to continue
*/