程序代码：

            Console.Write("Input String:");
            string input = Console.ReadLine();
            int[] infos = new int[4];

            infos[0] = Regex.Matches(input, "[a-zA-Z]").Count;
            infos[1] = Regex.Matches(input, "\\d").Count;
            infos[2] = Regex.Matches(input, " ").Count;
            infos[3] = input.Length - (infos[0] + infos[1] + infos[2]);

程序代码：

            double result = 0;
            int tempnumber = 1;
            int tempnumb = 1;
            int tempsum;
            for (int i = 0; i < 10; i++)
            {
                tempsum = tempnumber + tempnumb;
                if (i % 2 == 0)
                {
                    result += Convert.ToDouble(tempsum) / Convert.ToDouble(tempnumber);
                }
                else if (i % 2 == 1)
                {
                    result -= Convert.ToDouble(tempsum) / Convert.ToDouble(tempnumber);
                }
                tempnumb = tempnumber;
                tempnumber = tempsum;

            }

程序代码：

            double result = 0;
            int tempnumber = 1;
            int tempnumb = 1;
            int tempsum;
            int sh = -1;
            for (int i = 0; i < 10; i++)
            {
                sh *= -1;
                tempsum = tempnumber + tempnumb;
                result += sh * Convert.ToDouble(tempsum) / Convert.ToDouble(tempnumber);
                tempnumb = tempnumber;
                tempnumber = tempsum;
            }