每日算法 20130225 GLenn

编写一个方法用于验证指定的字符串是否为反转字符，返回true和false。请用递归算法实现

        static void Main(string[] args)
        {

            string[] strs = { "cabgfcgfbac", "ab", "abc", "abcca" };

            foreach (string str in strs)
                Console.WriteLine("{0} is {1}", str, method(str));
            Console.ReadLine();

        }



        private static bool method(string str)
        {

            if (str.Length <= 1) 
                return true;

            if (str[0] != str[str.Length - 1])
                return false;

            return method(str.Substring(1, str.Length - 2));

        }