我正在尝试使用使用数组的程序在测试中输出整体班级平均值。该计划是针对一个 12 名学生的班级。当我尝试输入我需要的所有数据时，我没有得到整个班级的平均值。问题显然在于普通计算器本身，但鉴于我是初学者，我几乎不知道如何解决它。任何帮助，将不胜感激。重申一下，我正在寻找一个解决方案，以解决如何修复我的平均计算器以给出班级平均水平。我在下面输入了我的代码。我希望我已经具体了。

string[] studentnames = new string[12];
        int[] testscore = new int[12];

        int i;
        int index;
        double average;
        int total = 0;

        //title

        Console.Write("\n\nStudent lists:\n");

        Console.Write("******************\n");

        //asks user to input names

        Console.Write("Enter student names:\n");

        for (i = 1; i < 12; i++)

        {

            Console.Write("Student name {0} : ", i);

            studentnames[i] = (Console.ReadLine());

            //asks user to enter student's test score

            Console.Write("Please enter their test score: ");

            testscore[i] = Convert.ToInt32(Console.ReadLine());

        }

        //outputs all values user has entered

        Console.WriteLine("\nStudent marks: ");

        for (i = 1; i < 12; i++)

        {

            Console.WriteLine("Name: ");

            Console.WriteLine("{0} ", studentnames[i]);

            Console.WriteLine("Test score: ");

            Console.WriteLine("{0} ", testscore[i]);

        }

        for (index = 1; index < 12; index++)
        {
            total = total + testscore[index];
            average = total / 12;

            Console.WriteLine("The class average was: " + average);
        }
        Console.ReadKey();