Question

Application should be in C# programming language

Create a class called SavingsAccount.  Use a static variable called annualInterestRate to store the annual interest rate for all account holders.  Each object of the class contains a private instance variable savingsBalance, indicating the amount the saver currently has on deposit. Provide method CalculateMonthlyInterest to calculate the monthly interest by multiplying the savingsBalance by annualInterestRate divided by 12 – this interest should be added to savingsBalance.  Provide static method setAnnualInterestRate to set the annualInterestRate to a new value. Write an application to test class SavingsAccount.  Create three savingsAccount objects, saver1, saver2, and saver3 with balances of $2,000.00, $3,000.00, and 0.00, respectively.  Set annualInterestRate to 4%, then calculate the monthly interest and display the new balances for both savers.  Then set the annualInterestRate to 5%, calculate the next month’s interest and display the new balances for both savers.

Technical Requirements:

Create SavingsAccount class with static variable annualInterestRate and private instance variables savingsBalance (double) and savingsAccountName (string).

Create a mutator method to set the savingsAccountName.  Call this method setSavingsAccountName.  The method should take a string argument and return void.

Create an accessor method to retrieve the savingsAccountName.  Call this method getSavingsAccountName.  The method should take no arguments and return a string (i.e. the savingsAccountName).

Create a mutator method to set the savingsBalance.  Call this method setSavingsBalance.  The method should take a double argument and return void.  

Create an accessor method to retrieve the savingsBalance.  Call this method getSavingsBalance.  The method should take no arguments and return a double (i.e. the savingsBalance).

Include two constructors. The first takes no arguments and sets the savingsBalance variables to zero and sets the savingsAccountName to an empty string by calling the second (i.e. two argument) constructor with 0 and an empty string.  The second constructor takes one double argument (the savingsBalance) and one string argument (the savingsAccountName), and sets the savingsBalance by calling the setSavingsBalance method and setsavingsAccountName method, respectively.

Create CalculateMonthlyInterest method with formula.  The method should return void.

Create setAnnualInterestRate method to take a double argument representing the annualInterestRate and return void.

Create PrintSavingsAccount method to display the savingsBalance, savingsAccountName, and annualInterestRate for an object.  Use the output shown below as a guideline for the display.

Create a separate class called SavingsAccountTest, which contains the Main() method.

In the Main() method, create three savingsAccount objects called saver1,  saver2, and saver3.  Initialize saver1 and saver2 with the balances listed above and the names “Saver_One” and “Saver_Two”, respectively.  Do not initialize saver3 with anything.  Instead, create the object by invoking its zero-argument constructor, which will initialize its balance to 0 and its name to an empty string.

In the Main() method, call setAnnualInterestRate to set the interest rate to 4%.

Next, call the setSavingsAccountName for saver3 to set its name to “Saver_Three”.  Then, call the setSavingsAccountBalance for saver3 to set its balance to $50,000.

Print the results by calling PrintSavingsAccount for each object.

Next, call the CalculateAnnualInterestRate method for all three saver objects.

Print the results again by calling PrintSavingsAccount for each object.

Next, change the annualInterestRate to 5% by calling the setAnnualInterestRate method.

Print the results again by calling PrintSavingsAccount for each object.

-DK file:///C/209 C#Programming/Programming Assignments/Module 4/Assignment-4-Solution/Assignment-... Initial savings account balances: Saver_One Saver_Two Saver_Three C:h 4000 5000 50000 .04 0.04 0.04 Savings account balances after calculating monthly interest at 4%: Saver_One Saver_Two Saver_Three 4013.33333333333 5016.66666666667 50166.666666666 0.04 0.04 0.04 Savings account balances after calculating monthly interest at 5%: Saver_One Save W0 Saver_Three 4013.33333333333 5016.66666666667 50166.6666666667 0.05 0.05 0.05 Press the enterl key to quit.

Answer 1

Done. I have added comments everywhere but still if you get any doubt please leave a comment I will get back to you. Output screenshot is also included.

///////////////////////////////////////SavingAccount.cs/////////////////////////////////////////////////////////

using System;

namespace AccountsApp
{

    public class SavingsAccount
    {
        //Annual interest rate for all account holders
        private static double annualInterestRate;
        // the amount the saver currently has on deposit
        private double savingsBalance;
        private string accountName;
        
        //constructor with no args. It sets balance and account name to initial values
        public SavingsAccount()
        {
            this.savingsBalance=0;
            this.accountName="";
        }
        
        //The second constructor takes one double argument (the savingsBalance) and one string argument
        public SavingsAccount(double balance, string acctName){
            setSavingsAccountBalance(balance);
            setSavingsAccountName(acctName);
        }
        //sets account name to passed values
        public void setSavingsAccountName (string name){
            this.accountName=name;
        }
        //returns account name
        public string getSavingAccountName(){
            return this.accountName;
        }
        //sets account balance
        public void setSavingsAccountBalance(double bal){
            this.savingsBalance=bal;
        }
        //calculate the monthly interest
        public void CalculateMonthlyInterest(){
            double monthelyInterest = annualInterestRate/12;
            double interest =    this.savingsBalance*monthelyInterest;
            double balance = getSavingAccountBalance()+interest;
            setSavingsAccountBalance(balance);
        }
        //sets annual interest rate
        public static void setAnnualInterestRate(double iRate){
            annualInterestRate=iRate;
        }
        //return saving balamce
        public double getSavingAccountBalance(){
            return this.savingsBalance;
        }
        //return annual interest
        public double getAnnualIntereset(){
            return annualInterestRate;
        }
        //prints all the values
        public void PrintSavingsAccount (){
            Console.WriteLine("{0,-20} {1,5}{2,15}", getSavingAccountName(), getSavingAccountBalance(),getAnnualIntereset());
        }
    }
}

/////////////////////////////////////////////End SavingAccount.cs//////////////////////////////////

////////////////////////////////////////////////////TestSavingAccounts.cs/////////////////////////////////////////////

using System;

namespace AccountsApp
{
    class Program
    {
        public static void Main(string[] args)
        {
            
            SavingsAccount saver1 = new SavingsAccount(4000.0, "Saver_One");
            SavingsAccount saver2 = new SavingsAccount(5000.0, "Saver_Two");
            //not initialize saver3 with anything. Only Zero arg constructor to be used
            SavingsAccount saver3 = new SavingsAccount();
            
            //setAnnualInterestRate to set the interest rate to 4%
            SavingsAccount.setAnnualInterestRate(0.04);
            //setSavingsAccountName for saver3 to set its name to “Saver_Three”
            saver3.setSavingsAccountName("Saver_Three");
            // set its balance to $50,000
            saver3.setSavingsAccountBalance(50000.0);
            
            Console.WriteLine("Initial Saving account balances:");
            //Print the results by calling PrintSavingsAccount for each object.
            saver1.PrintSavingsAccount();
            saver2.PrintSavingsAccount();
            saver3.PrintSavingsAccount();
            
            //call CalculateMonthlyInterest on each object
            saver1.CalculateMonthlyInterest();
            saver2.CalculateMonthlyInterest();
            saver3.CalculateMonthlyInterest();
            
            Console.WriteLine("Saving account balance after calculating monthly interest at 4% :");
            //Print the results by calling PrintSavingsAccount for each object.
            saver1.PrintSavingsAccount();
            saver2.PrintSavingsAccount();
            saver3.PrintSavingsAccount();
            //set the annualInterestRate to 5%
            SavingsAccount.setAnnualInterestRate(0.05);
            Console.WriteLine("Saving account balance after calculating monthly interest at 5% :");
            //Print the results by calling PrintSavingsAccount for each object.
            saver1.PrintSavingsAccount();
            saver1.PrintSavingsAccount();
            saver2.PrintSavingsAccount();
            saver3.PrintSavingsAccount();
            
            Console.Write("Press any key to continue . . . ");
            Console.ReadLine();
        }
    }
}

///////////////////////////////////////////END////////////////////////////////////////

Output Screenshot

AccountsApp-SharpDevelop File Initial Saving account balances: Saver One 9.04 9.04 0.04 aver TwO aver_Three aving account balance after calculating monthly interest at 4% : aver One aver TwO aver_Three aving account balance after calculating monthly interest at 5% : aver One aver One aver TwO aver_Three ress any key to continue .. . 5600 56000 4013.33333333333 5016. 66666666667 50166.6666666667 0.04 9.04 0.64 Build action Compile Copy to output c Never Custom Tool File name C: 4013.33333333333 4013.33333333333 5016. 66666666667 50166.6666666667 0.05 6.e5 6.e5 0.e5 Build action The build action of that file OutputErrorsLocal variables Build finished successfully Callstack Watch Console In 49 col 30 ch 21 O Type here to search ENG 22:23 INTL 15-04-2019 2