//Programmer: Ryan

//Date: Start: May 3 - End: May 4

//Project: Billionaire

//Description: A calculator that figures out how long it would take for you to make a billion dollars given a initial value and investment percent

using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("How much are you investing? ($)");

        double investment, rate;

        redoInvestment:

            double investmentInterest = 0;

        int year = 0;

        if (!double.TryParse(Console.ReadLine(), out investment)) //error checking & asking the user of the base amount of money

        {

            Console.WriteLine("Invalid input. Please try again.");

            goto redoInvestment;

        }

​

        Console.WriteLine("At what rate are you investing at? (In %)");

        redoRate:

            if (!double.TryParse(Console.ReadLine(), out rate)) // Asking the user the investment rate

            {

                Console.WriteLine("Invalid input. Please try again.");

                goto redoRate;

            }

​

        double interestRate = rate / 100; // Takes the user input and divides it by 100 to create a usable percent

        Console.WriteLine("Year               Interest                  Balance"); // Formatting

        while (investment <= 1000000000) // Loops until investment/balance is greater or equal to one billion

        {

            investmentInterest = interestRate * investment; // Calculates the amount that is made after one year by taking the intial value and multiplying it by the interest

            investment += investmentInterest; // Adds the products to the current investment value

            year++; // Adds one to the year for each time it loops

            Console.WriteLine("{0}{1,25},{2,25}", year, investmentInterest.ToString("C2"), investment.ToString("C2")); // Prints the current results

        }

    }

}