For this task, you will be asked to write a program that calculates compound interest.

Where:

A = Accrued Amount (principal plus interest)

P = Principal Amount

r = Annual interest rate (as decimal)

t = Number of years

n = Number of times interest is compounded per year

As a special requirement for this task you are required to write your program using methods. We have provided a template for the program, and you will need to finish the implementation. You will need to finish the method heading of two methods - WelcomeMessage() and ExitProgram() - by selecting the appropriate modifiers and return types, and finish the header and method body of OutputResult(). Finally, you will need to implement two CalculateCompoundInterest() methods which calculate the accrued amount - one which takes as parameters the principal, interest rate, and number of years accumulating interest, and assumes the number of times interest is compounded per year is daily (365), and another that allows the number of compounds per year to be specified.

Your code will be run by calling the two versions of the CalculateCompoundInterest() method, OutputResult() and ExitProgram() methods directly. As a result, make sure you make these methods public.

A framework has been provided for your convenience in writing the program. The comments (// ...) give you hints about the code you need to add to make the program work.

CODE:

using System; namespace CompoundInterestCalculator { public class CompoundCalculator { const int EXIT = 0; const int CALCULATE_DAILY = 1; const int CALCULATE_QUARTERLY = 2; const int CALCULATE_VARIABLE = 3; const int NUM_OPTIONS = 3; public static void Main() { int menuOption; WelcomeMessage(); do { DisplayMenu(); menuOption = ReadOption(); if (menuOption != EXIT) { double finalAmount = CalculateInterest(menuOption); OutputResult(finalAmount); } } while (menuOption != EXIT); ExitProgram(); } // end Main // Fill in the appropriate modifier and return type (_ _) in the method declaration public _ _ WelcomeMessage() { Console.WriteLine(" \tCompound Interest Calculator "); } // end WelcomeMessage // Fill in the appropriate modifier and return type (_ _) in the method declaration public _ _ ExitProgram() { Console.Write(" Press enter to exit."); Console.ReadLine(); } // end ExitProgram static void DisplayMenu() { string menu = " 1) Calculate final amount after interest (compounded daily)" + " 2) Calculate final amount after interest (compounded quarterly)" + " 3) Calculate final amount after interest (define number of times compounded yearly)" + " Enter your option(1-3 or 0 to exit): "; Console.Write(menu); } // end DisplayMenu public static void OutputResult(double finalAmount) { // Display the message "The final amount of money plus interest is: $(amount)" // The amount should display as currency, with two decimal places, e.g. $10,000.00 } // end OutputResult static int ReadOption() { string choice; int option; bool okayChoice; do { choice = Console.ReadLine(); okayChoice = int.TryParse(choice, out option); if (!okayChoice || option < 0 || option > NUM_OPTIONS) { okayChoice = false; Console.WriteLine("You did not enter a correct option. Please try again"); DisplayMenu(); } } while (!okayChoice); return option; } // end ReadOption public static double CalculateInterest(int menuOption) { // (For this exercise, we will assume the user is inputting correct input.) double principal; double interestRate; int numYears; double finalAmount; Console.Write("Enter the principal amount: "); principal = Double.Parse(Console.ReadLine()); Console.Write("Enter the interest rate: "); interestRate = Double.Parse(Console.ReadLine()); Console.Write("Enter the number of years that interest is accumulated for: "); numYears = Int32.Parse(Console.ReadLine()); if (menuOption == CALCULATE_DAILY || menuOption == CALCULATE_QUARTERLY) { if (menuOption == CALCULATE_DAILY) { // Call the appropriate CalculateCompoundInterest method } else { // Call the appropriate CalculateCompoundInterest method } } else { Console.Write("Enter the number of times the interest is compounded yearly: "); int numTimesCompounded = Int32.Parse(Console.ReadLine()); // Call the appropriate CalculateCompoundInterest method } Console.WriteLine(); // return the amount calculated by the compound interest method } // End CalculateInterest // Declare and implement the method CalculateCompoundInterest whose parameters are the principal, interest rate, and number of years (in that order)- make sure it is public! // For the declaration select an appropriate modifier, return type, and types for the parameters // This version assumes the interest is compounded daily (365 times a year) // For both methods, you should assume the interest rate is input already in decimal form (i.e. 0.02 rather than 2 for a 2% rate) // Declare and implement the method CalculateCompoundInterest whose parameters are the principal, interest rate, number of years, and number of times compounded yearly - make sure it is public! // For the declaration select an appropriate modifier, return type, and types for the parameters // This version allows the number of times compounded yearly to be specified. }//end class }//end namespace