不规则表格问题

Question

我想知道我在该任务上做错了什么

我必须创建一个表格[] [，]，从那里我从键盘上输入组的数量，每个组中的学生数量以及他们拥有多少科目。

对于每个学生，我必须为每个学科输入一个成绩。

我实际上不是我的错误在哪里。

因为我编写的程序无法正确显示完整的表（例如，如果在第1组中我有3个学生，而在第2组中我有1个学生，则每个第1组学生都会显示该表）

我还使用“浮点数”来计算每组所有年级的平均值，但是它显示了整数。

你能帮我吗？

我在下面附加了代码。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SpecialTask
{
    class Program
    {
        static int[][,] tab1;
        static int iSub = 0;
        static int iGro = 0;
        static int iStu = 0;
        static int note = 0;
        static int iSum = 0;
        static float fAvg = 0.0f;

        static int Subjects(string sSubjects)
        {
            do
            {
                Console.WriteLine("Please enter a number of subjects (2-4):");
            }
            while ((!int.TryParse(Console.ReadLine(), out iSub)) || (iSub < 2) || (iSub > 4));
            return iSub;
        }

        static int Groups(string sGroups)
        {
            do
            {
                Console.WriteLine("Please enter a number of groups (1-3):");
            }
            while ((!int.TryParse(Console.ReadLine(), out iGro)) || (iGro < 1) || (iGro > 3));
            return iGro;
        }

        static int Students(string sStudents)
        {
            do
            {
                Console.WriteLine("Please enter a number of students(1-5): ");
            }
            while ((int.TryParse(Console.ReadLine(), out iStu) == false) || (iStu < 1) || (iStu > 5));
            return iStu;
        }

        static int Notes(string sNotes)
        {
            do
            {
                Console.WriteLine("Please enter a note (2-5): ");
            }
            while ((!int.TryParse(Console.ReadLine(), out note)) || (note < 2) || (note > 5));
            return note;
        }

        static void TabData()
        {

            int i, j, k;
            Subjects("Please enter a number of subjects (2-4):");
            Groups("Please enter a number of groups (1-3):");
            tab1 = new int[iGro][,];

            for (i = 0; i < iGro; i++)
            {
                Console.WriteLine("Group NO.{0}", 1 + i);
                Students("Please enter a number of students(1-5): ");
                tab1[i] = new int[iStu, iSub];
                for (j = 0; j < iStu; j++)
                {
                    for (k = 0; k < iSub; k++)
                    {
                        Console.WriteLine("Student NO.{0}", 1 + j);
                        Console.WriteLine("Subject NO.{0}", 1 + k);
                        tab1[i][j, k] = Notes("Please enter a note (2-5): ");
                    }
                }
            }

            Console.WriteLine("\n");
            Console.WriteLine("\n");
            for (i = 0; i < iGro; i++)
            {
                Console.WriteLine("Group NO.{0}: ", 1 + i);
                for (j = 0; j < tab1.Length; j++)
                {
                    Console.WriteLine("Student NO.{0}/Group NO.{1}: ",1+ j, 1 + i);
                    for (k = 0; k < iSub; k++)
                    {
                        Console.Write("Subject NO.{0}: ", 1 + k);
                        Console.Write(tab1[i][j, k]);
                        Console.Write("\n");
                    }
                    Console.WriteLine("\n");
                }
            }
        }

        static void avgG()
        {
            int i, j, k;
            TabData();
            for (i = 0; i < iGro; i++)
            {
                for (j = 0; j < iStu; j++)
                {
                    for (k = 0; k < iSub; k++)
                    {
                        iSum = iSum + tab1[i][j, k];
                    }
                }
                fAvg = iSum / iSub;
                Console.WriteLine("Sum: " + iSum);
                Console.WriteLine("Average of all grades for Group NO. {0}: {1}", i, fAvg);
            }
        }

        static void Main(string[] args)
        {
            avgG();
            Console.ReadKey();
            Console.ReadKey();
        }
    }
}