using System;

/*

Full Name: Morgan Moran

IU Username: morgmora

Replit Username: morgmora@iu.edu

​

Abbreviated assignment instructions and other notes have been migrated to 'README.md' in the Files tab.

*/

​

class Mortgage

{

  //Declare properties/fields

  double amount;

  double rate;

  double term; 

  // double monthly;

​

 /* double amount{

    get {

      return _amount;

    }

    set{

      _amount = value;

    }  

  }

​

  double rate{

    get{

      return _rate;

    }

    set{

      _rate = value;

    }

  }

​

  double term{

    get{

      return _term;

    }

    set{

      _term = value;

    }

  } */

​

  public Mortgage(){

  }

  //Create a constructor

  public Mortgage(double lamount, double lrate, double lterm){

    amount = lamount ;

    rate = lrate;

    term = lterm;

  }

  //Create 3 methods: CalcPayment(), CalcTotalCost(), and CalcInterest()

  public double CalcPayment(double amount, double rate, double term){

    /*M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1]

      M = monthly payment

      P = principal

      i = monthly interest (interest rate / 12)

      n = number of months */

   double monthly = amount * Math.Pow(1 + rate,         term)/ (Math.Pow(1 + rate,term) - 1);

    return monthly;

  }

​

  public double CalcTotalCost(double monthly, double term){

    /*TC = M * n */

    double total = monthly * term;

    return total;

  }

​

  public double CalcInterest(double total, double amount){

    double totalinterest = total - amount;

    return totalinterest;

  }

}

​

class MainClass 

{

  public static void Main (string[] args) 

  {

    //Gather and validate user inputs

    string loanamount;

    double lamount; 

    Console.WriteLine("Enter Total Amount of Loan:       ");

    loanamount = Console.ReadLine();

​

    if (double.TryParse(loanamount, out lamount) ==       false)

      {Console.WriteLine("Invalid Input, Not a             Number");

      return;}

    if (lamount <=0)

      { Console.WriteLine("Invalid Input, Negative         Number");

        return; }

​

    string loanrate;

    double lrate;

    Console.WriteLine("Enter Interest Rate: ");

    loanrate = Console.ReadLine();

​

    if (double.TryParse(loanrate, out lrate) == false)

      {Console.WriteLine("Invalid Input, Not a Number");

      return;} 

​

    // validate that annual rate is not negative 

    if (lrate <0)

      { Console.WriteLine("Invalid Input, Negative Number");

        return; }

​

    // validate that the rate is between 0 and 1

    if(lrate > 1 || lrate < 0)

    {

      Console.WriteLine("Invalid Input, input is not between 0 and 1");

      return ; 

    }

​

    string loanterm;

    double lterm; 

    Console.WriteLine("Please Enter The Term of the Loan (in months): ");

    loanterm = Console.ReadLine();

​

    // try parsing input to validate it is a number

    if (double.TryParse(loanterm, out lterm) == false)

      {Console.WriteLine("Invalid Input, Not a Number");

      return;} 

​

    //validate that months are at least 1 month

    if(lterm <=1 )

    {

      Console.WriteLine("Invalid Input, must be between greater than 0");

      return;

    }

    //Instantiate a Mortgage and print calculations

    Mortgage news = new Mortgage();

    news.CalcPayment(10, .4, 3);

    Console.WriteLine(news.amount);

  }

}