using System;

public class Program

{

    public static void Main()

    {

        // Declare the necessary variables.

        //Declares variables that user will enter into the UI

        string strpresentvalue;

        string strinterestrate;

        string stryearsinvested;

        // Gather and validate the user inputs. Print a descriptive error and terminate execution if any input is invalid.

        //This block of code converts string to decimal and determines if the value entered is a postive number, and returns an error if not.

        Console.WriteLine("To determine the future value of your investment, first enter the initial investment amount as a positive numbers.");

        strpresentvalue = Console.ReadLine();

        decimal presentvalue;

        bool IsValidNumber1 = Decimal.TryParse(strpresentvalue, out presentvalue);

        if(IsValidNumber1 == false | presentvalue < 0)

        {Console.WriteLine("Please enter a valid investment value!");

            return;

        }

        //This block of code converts string to decimal determines if the value entered is a postive number between 0 and 1, and returns an error if not.

        Console.WriteLine("Next, enter the interest rate of your investment as a positive decimal. Ex.) Write 9% as 0.09");

        strinterestrate = Console.ReadLine();

        decimal interestrate;

        bool IsValidNumber2 = Decimal.TryParse(strinterestrate, out interestrate);

        if(IsValidNumber2 == false | interestrate < 0)

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

            return;

        }

        //This block of code converts string to integer determines if the value entered is a postive integer between 1 and 100, and returns an error if not.

        Console.WriteLine("Finally, enter the length of your investment in years, as a whole number between 1 and 100.");

        stryearsinvested = Console.ReadLine();

        int yearsinvested;

        bool IsValidNumber3 = int.TryParse(stryearsinvested, out yearsinvested);

        if(IsValidNumber3 == false | yearsinvested < 1 | yearsinvested > 100)

        {Console.WriteLine("Please enter a valid number of years!");

            return;

        }

        // Print every year and updated Future Value to the console using a loop.

        //This line of code prints the header of the two columns.

        Console.WriteLine("Year   Year End Value");

        //This last block of code contains the loop that runs the compound interest equation, and prints the value next to the year.

        for(int i = 0; i < yearsinvested; i++)

        {

            Console.WriteLine((i + 1) + "      $" + Math.Round(presentvalue = presentvalue * (1 + (interestrate)), 2));

        }

​

    }

}