第一版參考解答:

using System;

namespace homework6
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("請輸入班級人數");
            int peopleNum = int.Parse(Console.ReadLine());
            double[,] score = new double[peopleNum, 3];

            for (int i = 0; i < peopleNum; i++)
            {
                Console.WriteLine("請輸入第" + (i + 1) + "位同學的國文科成績");
                score[i, 0] = double.Parse(Console.ReadLine());
                Console.WriteLine("請輸入第" + (i + 1) + "位同學的英文科成績");
                score[i, 1] = double.Parse(Console.ReadLine());
                Console.WriteLine("請輸入第" + (i + 1) + "位同學的數學科成績");
                score[i, 2] = double.Parse(Console.ReadLine());
            }


            Console.WriteLine("編號\t國文\t英文\t數學");
            Console.WriteLine("--------------------------------");
 

            for (int i = 0; i < peopleNum; i++)
            {

                Console.Write((i + 1) + "\t" + score[i, 0]);
                Console.Write("\t" + score[i, 1]);
                Console.Write("\t" + score[i, 2]);
                Console.Write("\n");
 
            }

        }
    }
}


第二考參考解答:

using System;

namespace homework6
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("請輸入班級人數");
            int peopleNum = int.Parse(Console.ReadLine());
            double[,] score = new double[peopleNum, 3];

            for (int i = 0; i < peopleNum; i++)
            {
                Console.WriteLine("請輸入第" + (i + 1) + "位同學的國文科成績");
                score[i, 0] = double.Parse(Console.ReadLine());
                Console.WriteLine("請輸入第" + (i + 1) + "位同學的英文科成績");
                score[i, 1] = double.Parse(Console.ReadLine());
                Console.WriteLine("請輸入第" + (i + 1) + "位同學的數學科成績");
                score[i, 2] = double.Parse(Console.ReadLine());
            }


            Console.WriteLine("編號\t國文\t英文\t數學\t平均");
            Console.WriteLine("------------------------------------");
            double[] avg = new double[peopleNum];

            for (int i = 0; i < peopleNum; i++)
            {
                avg[i] = (score[i, 0] + score[i, 1] + score[i, 2]) / 3;
                Console.Write((i + 1) + "\t" + score[i, 0]);
                Console.Write("\t" + score[i, 1]);
                Console.Write("\t" + score[i, 2]);
                Console.Write("\t" + "{0:F2}", avg[i] );
                Console.Write("\n");
            }


        }
    }
}

第三版參考解答:

using System;

namespace homework6
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("請輸入班級人數");
            int peopleNum = int.Parse(Console.ReadLine());
            double[,] score = new double[peopleNum, 3];

            for (int i = 0; i < peopleNum; i++)
            {
                Console.WriteLine("請輸入第" + (i + 1) + "位同學的國文科成績");
                score[i, 0] = double.Parse(Console.ReadLine());
                Console.WriteLine("請輸入第" + (i + 1) + "位同學的英文科成績");
                score[i, 1] = double.Parse(Console.ReadLine());
                Console.WriteLine("請輸入第" + (i + 1) + "位同學的數學科成績");
                score[i, 2] = double.Parse(Console.ReadLine());
            }


            Console.WriteLine("編號\t國文\t英文\t數學\t平均");
            Console.WriteLine("------------------------------------");
            double[] avg = new double[peopleNum];

            for (int i = 0; i < peopleNum; i++)
            {
                avg[i] = (score[i, 0] + score[i, 1] + score[i, 2]) / 3;
                Console.Write((i + 1) + "\t" + score[i, 0]);
                Console.Write("\t" + score[i, 1]);
                Console.Write("\t" + score[i, 2]);
                Console.Write("\t" + "{0:F2}", avg[i] );
                Console.Write("\n");
            }


            double chi=0;
            double eng=0;
            double math = 0;

            for (int j = 0; j < peopleNum; j++)
            {
                chi += score[j, 0];
                eng += score[j, 1];
                math += score[j, 2];
            }
            chi /= peopleNum;
            eng /= peopleNum;
            math /= peopleNum;
            Console.WriteLine("------------------------------------");
            Console.Write("平均" + "\t" + "{0:F2}", chi);
            Console.Write("\t" + "{0:F2}", eng );
            Console.Write("\t" + "{0:F2}", math );
            Console.Write("\n");
        }
    }
}


第四版參考解答:

using System;

namespace homework6
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("請輸入班級人數");
            int peopleNum = int.Parse(Console.ReadLine());
            double[,] score = new double[peopleNum,3];

            for (int i = 0; i < peopleNum; i++)
            {
                Console.WriteLine("請輸入第" + (i + 1) + "位同學的國文科成績");
                score[i, 0] = double.Parse(Console.ReadLine());
                Console.WriteLine("請輸入第" + (i + 1) + "位同學的英文科成績");
                score[i, 1] = double.Parse(Console.ReadLine());
                Console.WriteLine("請輸入第" + (i + 1) + "位同學的數學科成績");
                score[i, 2] = double.Parse(Console.ReadLine());
            }


            Console.WriteLine("編號\t國文\t英文\t數學\t平均\t名次");  
            Console.WriteLine("--------------------------------------------");
            double [] avg = new double[peopleNum];
            double[] avgCopy = new double[peopleNum];
            int [] seq = new int [peopleNum];
           
            //先計算總平均
            for(int i=0;i<peopleNum;i++)
            {
                 avg[i]=(score[i,0]+score[i,1]+score[i,2])/3;
                 avgCopy[i] = avg[i];
            }

            int idx = 0; 
            //計算名次
            Array.Sort(avgCopy);
            Array.Reverse(avgCopy);
            for(int i=0; i<peopleNum;i++)
            {
                idx=Array.IndexOf(avgCopy,avg[i]);
                seq[i]=idx+1;
            }

            //印出個人成績和名次
            for (int i = 0; i < peopleNum; i++)
            {
               
                Console.Write(  (i + 1) + "\t" + score[i, 0]);
                Console.Write("\t" + score[i, 1]);
                Console.Write("\t" + score[i, 2]);
                Console.Write("\t" + "{0:F2}", avg[i]);
                Console.Write("\t" + seq[i] + "\n");
            }

            double chi=0;
            double eng=0;
            double math = 0;

            for (int j = 0; j < peopleNum; j++)
            {
                chi += score[j, 0];
                eng += score[j, 1];
                math += score[j, 2];
            }
            chi /= peopleNum;
            eng /= peopleNum;
            math /= peopleNum;

            //印出各科平均
            Console.WriteLine("--------------------------------------------");
            Console.Write("平均" + "\t" + "{0:F2}", chi);
            Console.Write("\t" + "{0:F2}", eng );
            Console.Write("\t" + "{0:F2}", math );
            Console.Write("\n");
        }
    }
}