Consolidate entry-C basic variables and constants

            #region  Defining variables and  The difference between declaring variables 
            // Reference resources  http://t.zoukankan.com/zhouxiuquan-p-1912397.html
            int a = 1;

            string b = " Zhang San ";
            string str= " String definition ";

            Console.WriteLine(" High frequency variable printing , Numeric and string data value contents ："+a+b+str  );




            #endregion

            #region  Define constants  cont 

            //public const int demoa = 11;

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