using System;
using System.Collections.Generic;
using System.Text;

namespace LoopingExample
{
    class Program
    {
        static void Main(string[] args)
        {
            int i;

            // the FOR loop example
            for (i = 1; i <= 10 ; i++)
            {
                Console.Write(i + " ");
            }

            Console.WriteLine();

            // the WHILE loop example
            i = 1;
            while (i < 11)
            {
                Console.Write(i + " ");
                i++;
            }

            Console.WriteLine();

            // the DO WHILE loop example
            i = 1;
            do
            {
                Console.Write(i + " ");
                i++;
            } while (i <= 10);

            Console.WriteLine();

            // the summation of input from user example
            double userInput;
            string input;
            double sum = 0;

            int n = 0;

            do
            {
                Console.Write("Please enter a number (0 to quit) : ");
                input = Console.ReadLine();
                userInput = Double.Parse(input);
                // userInput = Double.Parse(Console.ReadLine());
                sum += userInput;
                n++;
            } while (userInput != 0);

            Console.WriteLine("The sum is = " + sum);

            n--;
            if (n == 0)
                Console.WriteLine("No numbers to average");
            else
                Console.WriteLine("The average is = " + (sum / n));
        }
    }
}