using System;

public class Mortgage

{

    private double principal //properties

    {get; set;}

    private double interestRate

    {get; set;}

    private int term

    {get; set;}

    //constructor

    public Mortgage(double p, double i, int t) 

    {

        principal=p;

        interestRate=i;

        term=t;

    }

    //methods

    public string calcPayment()

    {

        double m;

        m=principal*(((interestRate/12)*Math.Pow((1+(interestRate/12)),term))/(Math.Pow((1+(interestRate/12)),term)-1));

        return (m).ToString("C2");

    }

    public string calcTotalCost()

    {

        double tc;

        //m was a local variable, so it needs to be redefined

        double m;

        m=principal*(((interestRate/12)*Math.Pow((1+(interestRate/12)),term))/(Math.Pow((1+(interestRate/12)),term)-1));

        tc=Math.Round(m,2)*term;

        return (tc).ToString("C2");

    }

    public string calcInterest()

    {

        double ti;

        double tc;

        double m;

        //m and tc were local variables, so they need to be redefined

        m=principal*(((interestRate/12)*Math.Pow((1+(interestRate/12)),term))/(Math.Pow((1+(interestRate/12)),term)-1));

        tc=Math.Round(m,2)*term;

        ti=tc-principal;

        return (ti).ToString("C2");

    }

    public static void Main()

    {

        // Create an instance of a mortgage

        Mortgage loan = new Mortgage(200000,0.05,360);

        Console.WriteLine("The mortgage's principal is: " + loan.principal);

        Console.WriteLine("The mortgage's payment is: " + loan.calcPayment());

        Console.WriteLine("The mortgage's total cost is: " + loan.calcTotalCost());

        Console.WriteLine("The mortgage's total cost is: " + loan.calcInterest());

​

    }

}

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