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

namespace ConsoleApplication8
{
    class Program
    {
        static void Main(string[] args)
        { }
        class Data
        {
            string[] word = new string[4];
            string[] keyword = new string[4];

            static int s_num = 0;
            static int b_num = 0;

            public void Print()
            {
                Console.WriteLine("+++++++++++++++++++++++++++++++++++");
                Console.WriteLine("+       신나는 야구겜              +");
                Console.WriteLine("+++++++++++++++++++++++++++++++++++");
            }
            public void RandomData()
            {
                Random r = new Random();
                string rNum = null;
                for (int i = 0; i < 3; i++)
                {
                    rNum = (string)(r.Next(0, 10).ToString());

                    keyword[i] = rNum;
                    if (keyword[0] == keyword[1] || keyword[0] || keyword[2]
                        || keyword[1] == keyword[2])
                        rNum = (string)(r.Next(0, 10).ToString());
                    keyword[3] = null;
                    Console.Write("[ {0}\\t", keyword[i]);
                }
            }
            public bool InputData()
            {
                Console.WriteLine("");
                Console.WriteLine("3개의 숫자를 하나씩 입력하세요. : ");

                string sNum;

                sNum = Console.ReadLine();
                word = sNum.Split(\' \', \',\');

                if (word.Length != 3)
                {
                    Console.WriteLine("3개의 수를 꼭 입력해야 합니다.");
                    return false;
                }

                for (int i = 0; i < word.Length; i++)
                {
                    if (Convert.ToInt32(word[i]) > 9)
                    {
                        Console.WriteLine("0~9사이의 값을 입력");
                        return false;
                    }
                }

            }
        }
    }
}


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야구게임을 만들려고하는데요 이렇게해서 컴파일을 하니깐 이런오류가 나오네요..