using System;

class Mortgage

{

  //Declare properties/fields //make all string and then calc makes it int

    public string LoanAmt;

    public string InterestRate;

    public string LoanTerms;

    public double Payment { get; set; }

    public double Cost { get; set; }

    public double Interest { get; set; }

​

  //Create a constructor

    public Mortgage()

    {

    }

    public Mortgage(string P, string ir, string n, double cp, double c, double i)

    {

        LoanAmt = P;

        InterestRate = ir;

        LoanTerms = n;

        Payment = cp;

        Cost = c;

        Interest = i;

    }

  //Create 4 methods: CalcPayment(), CalcTotalCost(), CalcInterest(), ToString*()

    //Method 1:

    public double CalcPayment()

    {

        int iLoanAmt = Convert.ToInt32(LoanAmt);

        double dblInterestRate = (Convert.ToDouble(InterestRate)/12);

        int iLoanTerms = Convert.ToInt32(LoanTerms);

            Payment = iLoanAmt *(dblInterestRate * Math.Pow((1+dblInterestRate),iLoanTerms) / (Math.Pow((1+dblInterestRate),iLoanTerms) - 1));

        return Payment;

    }

    //Method 2:

    public double CalcTotalCost()

    {

        int iLoanTerms = Convert.ToInt32(LoanTerms);

            Cost = Payment * iLoanTerms;

        return Cost;

    }

    //Method 3:

    public double CalcInterest()

    {

        Interest = Cost - Payment;

        return Interest;

    }

    //Method 4:

    public string ToStrings()

    {

        int[] colW = new int[3] {4, 10, 8};

        string gap = "".PadRight(10); 

        string gap2 = "".PadRight(15); 

        Console.WriteLine(

          "Monthly Payment".PadLeft(colW[0]) + gap +

          "Total Cost".PadLeft(colW[1]) + gap +

          "Total Interest".PadLeft(colW[2]));

        Console.WriteLine(

          "".PadRight(colW[0], '-') + gap2 +

          "".PadRight(colW[1], '-') + gap2 +

          "".PadRight(colW[2], '-')

          );

        var counter1 = 0;

      var threshold1 = 2;

      do

      {counter1++;

            return

            (

        Payment.ToString("C").PadLeft(colW[0]) + gap +

        Cost.ToString("C").PadLeft(colW[1]) + gap +

        Interest.ToString("C").PadLeft(colW[2])

      );

      }

        while(counter1<=threshold1);

    }

}

public class MainClass 

{

  public static void Main (string[] args) 

  {

      var counter = 0;

      var threshold = 2;

      do

      {

      string LoanAmt="";

      double dblPresentValue1 = 0.0;

      string InterestRate="";

      double dblPresentValue2 = 0.0;

      string LoanTerms="";

      double dblPresentValue3 = 0.0;

      Mortgage mortgage = new Mortgage();

​

      var counter2 = 0;

      var threshold2 = 0;

      do

      {

      //Loan amount

        Console.Write("Enter princial loan amount= ");

        LoanAmt = Console.ReadLine();

        if (!double.TryParse(LoanAmt, out dblPresentValue1) || dblPresentValue1 <= 0)

        {

            Console.WriteLine("Princial Loan Amount must be positive number!");

            return;

        }

      //Rate

            Console.Write("Enter annual interest rate (as percentage)= ");

            InterestRate = Console.ReadLine();

            if (!double.TryParse(InterestRate, out dblPresentValue2) || dblPresentValue2 <= 0)

            {

                Console.WriteLine("Rate must be positive number!");

                return;

            }

      //Terms

        Console.Write("Enter monthly term of loan= ");

            LoanTerms = Console.ReadLine();

            if (!double.TryParse(LoanTerms, out dblPresentValue3) || dblPresentValue3 <= 0)

            {

                Console.WriteLine("Term must be positive number!");

                return;

            }

     counter2++;

      }

      while (counter2<=threshold2); 

      //create

      mortgage.LoanAmt = LoanAmt;

      mortgage.InterestRate = InterestRate;

      mortgage.LoanTerms = LoanTerms;

     //write

     Console.WriteLine(mortgage.CalcPayment());

     Console.WriteLine(mortgage.CalcTotalCost());

     Console.WriteLine(mortgage.CalcInterest());

      Console.WriteLine(mortgage.ToStrings());

​

       counter++;

      }

      while (counter<=threshold);   

  }

}

​