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);

​

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

    }

    //Method 2:

    public double CalcTotalCost()

    {

        int iLoanTerms = Convert.ToInt32(LoanTerms);

        return Cost = Payment * iLoanTerms;

    }

    //Method 3:

    public double CalcInterest()

    {

        return Interest = Cost - Payment;

    }

    //Method 4:

    public string ToStrings()

    {

        string gap = "".PadRight(4); 

        return ((("Monthly Payment: ")+(Payment.ToString("C").PadLeft(4))) + gap +((("Total Cost: ")+Cost.ToString("C").PadLeft(4))) + gap +((("Total Interest: ")+Interest.ToString("C").PadLeft(4)))); 

    }

}

public class MainClass 

{

  public static void Main (string[] args) 

  {

      //Loan amount

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

        string LoanAmt = Console.ReadLine();

        double dblPresentValue1 = 0.0;

        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)= ");

        string InterestRate = Console.ReadLine();

        double dblPresentValue2 = 0.0;

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

        {

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

            return;

        }

      //Terms

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

        string LoanTerms = Console.ReadLine();

        double dblPresentValue3 = 0.0;

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

        {

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

            return;

        }

      //create

      Mortgage mortgage = new Mortgage();

      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());

​

  }

}

​