C#保留两位小数输出

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

namespace KnowledgePoint
{
    class _37_Ex_Reserve2AndPrime
    {
        static void Main(string[] args)
        {
            #region 计算整形数组元素的平均值，保留两位小数输出
            int[] intArr = { 1, 2, 7, 0, 0, 1 };
            double avg = TakeTheMean(intArr);
            string strAvg = avg.ToString("0.00");
            avg = Convert.ToDouble(strAvg);
            Console.WriteLine("数组元素平均值保留两位小数输出：" + avg);
            #endregion

            #region 四舍五入保留两位小数输出
            double point = 3.147;
            Console.WriteLine("\n四舍五入保留两位小数输出：" + point.ToString("0.00"));
            #endregion
            
            Console.ReadKey();
        }
        
        /// 

        /// 求平均值
        /// 
        /// 
        /// 
        private static double TakeTheMean(int[] array)
        {
            double sum = 0;
            for (int i = 0; i < array.Length; i++)
            {
                sum += array[i];
            }
            return sum / array.Length;
        }
    }
}