4D - for문

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

namespace Ex06ControlStatemen4
{
    class Program
    {
        static void Main(string[] args)
        {
            // 1 ~ 10 까지 합
            int sum = 0;
            //for (int i = 1; i <= 10; i++)
            //    sum += i;

            int index = 1;
            for (; index <= 10; )
            {
                sum += index;
                index++;
            }

            Console.WriteLine("SUM of 1 ~ 10 : {0}", sum);

            //2.입력받은 단에 해당하는 구구단 출력
            Console.Write("출력할 구구단을 입력하세요 : ");
            int number = int.Parse(Console.ReadLine());
            for (int i = 1; i < 10; i++)
            {
                Console.WriteLine("{0} * {1} = {2}",
                    number, i, number * i);
            }

            for (int y = 1;y < 10 ;y++ )
            {
                for (int x  = 1; x < 10; x++)
                {
                    Console.Write("{0}*{1}={2,2}\t", x, y, x * y); // { 2,2 } 는  칸을2칸으로 고정   \t 텝 만큼 뛰운다
                }
                Console.WriteLine();
            }
           
        }
    }
}