.Net学习笔记----2015-07-08(基础复习和练习05)

        static void Main(string[] args)
        {
            string[] strs = { "马龙", "迈克尔乔丹", "雷吉米勒", "蒂姆邓肯", "科比布莱恩特" };
            Console.WriteLine("最长的字符串是：{0}",ExportStr(strs));
            Console.ReadKey();
        }
        /// <summary>
        /// 判断字符串数组中最长的那个元素
        /// </summary>
        /// <param name="strs">要判断的字符串数组</param>
        /// <returns>返回最长的字符串</returns>
        static string ExportStr(params string[] strs)
        {
            string maxstr = "";
            for (int i = 0; i < strs.Length; i++)
            {
                if (strs[i].Length > maxstr.Length)
                {
                    maxstr = strs[i];
                }
            }
            return maxstr;
        }

        static void Main(string[] args)
        {
            int[] arr = { 1, 3, 5, 7, 93, 33, 4, 4, 6, 8, 10 };      
            //将输出结果保存2位小数。
            Console.WriteLine(Math.Round(Avg(arr),2));
            Console.ReadKey();
        }
        /// <summary>
        /// 计算一个整型数组的平均值
        /// </summary>
        /// <param name="arr">要被计算的整型数组</param>
        /// <returns>返回double类型的平均值</returns>
        static double Avg(params int[] arr)
        {
            double avg = 0.00;
            double sum = 0.00;
            for (int i = 0; i < arr.Length; i++)
            {
                sum += arr[i];
            }
            avg = sum / arr.Length;
            return avg;
        }