using System;

/*

Full Name: Olivia Sabatini Sukendro

IU username: olsasuke

Replit username: olsasukeAtiu

*/

​

//Create Mortgage class

public class Mortgage

{

    //Create three properties

    private double _principal;

    public double principal

    {

        get

        {

            return _principal;

        }

        set

        {

            if(value >= 0)

            {

                _principal = value;

            }

        }

    }

    private double _interest;

    public double interest

    {

        //Interest rate should be between 0.01 and 0.99. If violated, set 0.03 as default value.

        get

        {

            return _interest;

        }

        set

        {

            if (value < 0.01 || value > 0.99)

            {

                _interest = 0.03;

            }

            else

            {

                _interest = value;

            }

        }

    }

    private int _terms;

    public int terms

    {

        //Terms should be between 1 and 360. If violated, set 180 as the default value.

        get

        {

            return _terms;

        }

        set

        {

            if(value < 1 || value > 360)

            {

                _terms = 180;

            }

            else

            {

                _terms = value;

            }

        }

    }

    //Create three auto-implemented properties; monthly payment, total cost, total interest

    public double monthly_payment {get;set;}

    public double total_cost {get; set;}

    public double total_interest {get; set;}

    //Default constructor

    public Mortgage() {}

    //Second constructor with 3 parameters

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

    {

        principal = p;

        interest = IR;

        terms = t;

    }

    //Function: Calculate Payment

    public void CalculatePayment() //use "void" instead of double because we don't want the function to return any output

    {

        double power_base = (1+interest);

        double power_result = Math.Pow(power_base, terms);

        monthly_payment = principal * (interest * power_result) / (power_result - 1); 

        total_cost = monthly_payment * terms;

        total_interest = total_cost - principal;

    }

    //Function: Calculate ClosingFees

    public double CalculateClosingFees()

    {

        double closing_fees = 0;

        if (terms == 180)

        {

            closing_fees = 0.005 * principal;

        }

        else if (terms == 360)

        {

            closing_fees = 0.004 * principal;

        }

        else

        {

            closing_fees = 0.006 * principal;

        }

        return closing_fees;

    }

}

​

public class MainClass {

    public static void Main (string[] args)

    {

        //Create variables to store the user inputs

        //Print a message prompting the user to enter the principal

        Console.WriteLine("Please enter your principal amount.");

        double user_principalAmount;

        string user_principal = Console.ReadLine(); 

        //Validation: Principal should be a double and not negative

        bool IsValidDouble = double.TryParse(user_principal, out user_principalAmount);

        if (IsValidDouble == false || user_principalAmount < 0)

        {

            Console.WriteLine("Please enter valid principal amount.");

        }

        //Print a message prompting user to enter IR

        Console.WriteLine("Please enter your interest rate.");

        double user_interestRate;

        string user_interest = Console.ReadLine();

        //Validation: Interest Rate should be a double and between 0.01 and 0.99

        bool IsValidDouble2 = double.TryParse(user_interest, out user_interestRate);

        if (IsValidDouble2 == false || user_interestRate < 0.01 || user_interestRate > 0.99)

        {

            Console.WriteLine("Please enter a valid interest rate.");

        }

        //Print a message prompting user to enter terms (months)

        Console.WriteLine("Please enter your terms.");

        int user_terms;

        string user_term = Console.ReadLine();

        //Validation: Terms should be an integer and between 1 and 360

        bool IsValidInteger = Int32.TryParse(user_term, out user_terms);

        if (IsValidInteger == false || user_terms < 1 || user_terms > 360)

        {

            Console.WriteLine("Please enter valid terms.");

        }

        //Show Output

        Console.WriteLine("======================================");

        //Create Mortgage Object

        Mortgage mortgage_1 = new Mortgage(user_principalAmount, user_interestRate, user_terms);

        mortgage_1.CalculatePayment();

        Console.WriteLine("Mortgage monthly payment = " + mortgage_1.monthly_payment);

        Console.WriteLine("Mortgage closing fees = " + mortgage_1.CalculateClosingFees());

    }

}

​

//Comment

//Line 84: use "void" instead of double because we don't want the function to return any output

//Line 158: You must call out the CalculatePayment function first, otherwise monthly_payment variable won't be calculated.

//Line 159: changed to mortgage_1.monthly_payment because we want to access the variable monthly payment after the calculation not calculate it

​

​

//***Things that Olivia has to go back and fix ASAP!***

//Fix validation for principal amount. The program should not allow users to continue the input if the input is invalid. + validate for non-negative number as well

//Same for interest rate

//same for terms

//Check the math for monthly payment calculation

//Need to format output to currency with 2 decimal points

//Need to print Console.Writeline for Total Interest as well

​