第一次学数组，一直不能正确显示出来

int[,] score=new int[6,3];
double[] sum=new double[3];;double[] avg=new double[3];
Console.WriteLine("请输入成绩");
Console.WriteLine("语文 数学 英语");
for (int i = 0; i < 6; i++)
{
for (int j = 0; j < 3; j++)
{
string s = Console.ReadLine();
score[i, j] = Convert.ToInt32(s);
sum[j] += score[i, j];
}
Console.WriteLine("平均分是" + avg);
for (int k = 0; k < 3; k++)
{
avg[k] = sum[k]/6;
Console.WriteLine(avg[k]);
}

 static void Main(string[] args)
        {
            //声明一个二维数组  两行三列
            int[,] myIntArray1;
            myIntArray1 = new int[2, 3];
            myIntArray1[0, 0] = 1;
            myIntArray1[0, 1] = 11;
            myIntArray1[0, 2] = 111;
            myIntArray1[1, 0] = 2;
            myIntArray1[1, 1] = 22;
            myIntArray1[1, 2] = 222;
            Console.WriteLine("{0},{1},{2}", myIntArray1[0, 0], myIntArray1[0, 1], myIntArray1[0, 2]);
            Console.WriteLine("{0},{1},{2}", myIntArray1[1, 0], myIntArray1[1, 1], myIntArray1[1, 2]);
            Console.Read();
        }

帮你修改修改，容易阅读些。

            int[,] score=new int[6,3];
            double[] sum=new double[3];
            double[] avg=new double[3];
            Console.WriteLine("请输入成绩");
            for (int i = 0; i < 6; i++)//外循环为学生个数
            {
                Console.WriteLine("第{0}个学生的语文、数学、英语依次是：",i+1);
                for (int j = 0; j < 3; j++)//内循环为科目成绩
                {
                    string s = Console.ReadLine();
                    score[i, j] = Convert.ToInt32(s);
                    sum[j] += score[i, j];//单科成绩总和
                }
            }
            Console.WriteLine("每科的平均分依次是：");
            for (int k = 0; k < 3; k++)
            {
                avg[k] = sum[k]/6;
                Console.Write(avg[k]+"\t");
            }
            Console.ReadKey();