using System;

​

public class Program {

    static void Main() {

    Start:

        try {//using tr statement testing errors (if there is happen)

            int time = 1;//set basic variable, first year.

            Console.WriteLine("Welcome to Billionaires tester");

            Console.WriteLine("How much would you like to invest?");

            double invest = Convert.ToDouble(Console.ReadLine()); //readline and convert variable of invest.

            Console.WriteLine("What is your investment rate? (Must be positive, %):");

            double investr = Convert.ToDouble(Console.ReadLine()) / 100;//readline and convert variable of invest rate.

​

            double balance = invest;//double balance value

​

            Console.WriteLine($"Your invest input is {invest}, invest rate is {investr:P}, starting balance is {balance:C2}!");//display input just to make sure its clear

            Console.WriteLine("{0,5}{1,20}{2,20}", "Year", $"Interest ({investr * 100}%)", "Balance");//display chart titles.

             Console.WriteLine(new String('-', 50));

            while (balance < 1000000000) { //using while loop, keep calculating balance and interest by interest rate etc until balance become 1b.

                double interest = balance * investr;

                balance += interest;

​

                Console.WriteLine("{0,5}{1,20:C2}{2,20:C2}", time, interest, balance);//looping displaying each line of changing variables

                time++;//so this will make years increase 1 in each line of chart.

            }

            Console.WriteLine(new String('-', 50));

            Console.WriteLine($"It takes {time - 1} years to be billionaire");//cuz while loop will count extra number of years so I have to minus one

            if (time >= 1000000000){//My own add

                Console.WriteLine("Starts now get 1 dollar each day");

            }

            else if (time >= 400){

             Console.WriteLine("Tell me what model IPhone they have after your generation becomes billionaire");

            }

            else if (time >= 100){

             Console.WriteLine("I know you can do this.... maybe.");

            }

            else if (time >= 60){

             Console.WriteLine("More than half of your life, I respect you man!");

            }

            else if (time >= 20){

             Console.WriteLine("It is tough, huh?");

            }

            else {

             Console.WriteLine("Give me some money pls");

        } }

        catch (Exception) {//catch errors, goto start if got one.

            Console.WriteLine("An unexpected error occurred.");

            goto Start;

        }

    }

}

​