using System.Security.Cryptography;

using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("=====================================");

        Console.WriteLine("       Student Grade Project ");

        Console.WriteLine("=====================================");

        Console.WriteLine("How Many Students? ");

        int studentNum = int.Parse(Console.ReadLine());

        Console.WriteLine("How Many Subjects?");

        int subjectNum = int.Parse(Console.ReadLine());

        string [] subject = new string[subjectNum];

        string [] student = new string[studentNum];

        int [,] studentGrade = new int[studentNum, subjectNum];

        for (int x = 0; x < studentNum; x++)

                {

                    Console.WriteLine($"Enter Student: ");

                    student[x] = (Console.ReadLine());

                }

​

                for (int y = 0; y < subjectNum; y++)

                {

                    Console.WriteLine($"Enter Subject: ");

                    subject[y] = Console.ReadLine();

                }

​

                for (int x = 0; x < studentNum; x++)

                {

                    for (int y = 0; y < subjectNum; y++)

                    {

                        while (true)

                        {

                            Console.WriteLine($"{student[x]}'s {subject[y]} Grade: ");

                            int ans = int.Parse(Console.ReadLine());

                            if (ans < 101 && ans > -1)

                            {

                                studentGrade[x, y] = ans;

                                break;

                            }

                            else

                                Console.WriteLine("Try Again");

                        }

                    }

                }

        while()

        {

            Console.WriteLine("1 - Make a New List");

            Console.WriteLine("2 - Average Grade");

            Console.WriteLine("3 - Highest Grade");

            Console.WriteLine("4 - Lowest Grade");

            Console.WriteLine("5 - Display Grades");

            Console.WriteLine("6 - Exit");

            int num = int.Parse(Console.ReadLine());

            if (num == 1)

                makeNewList();

            if (num == 2)

                averageSubject(studentGrade, subjectNum, studentNum, subject);

            if (num == 3) 

                highestSubject(studentGrade, subjectNum, studentNum, subject);

            if (num == 4) 

                lowestSubject(studentGrade, subjectNum, studentNum, subject);

            if (num == 5)

                displayTable(subject, student, studentGrade);

            if (num == 6)

                break;

        }

    //highestSubject(studentGrade, subjectNum, studentNum, subject);

    //lowestSubject(studentGrade, subjectNum, studentNum, subject);

    }

​

    public static void highestSubject(int[, ] array, int top, int bot, string[] sub)

    {

        int max = 0;

        for (int x = 0; x < top; x++)

        {

            for (int y = 0; y < bot; y++)

            {

                if (array[x, y] >= max)

                    max = array[x, y];

            }

​

            Console.WriteLine($"{sub[x]} highest grade is {max}");

            max = 0;

        }

    }

​

    public static void lowestSubject(int[, ] array, int top, int bot, string[] sub)

    {

        int low = 101;

        for (int x = 0; x < top; x++)

        {

            for (int y = 0; y < bot; y++)

            {

                if (array[x, y] <= low)

                    low = array[x, y];

            }

​

            Console.WriteLine($"{sub[x]} lowest grade is {low}");

            low = 101;

        }

    }

​

    public static void averageSubject(int[, ] array, int top, int bot, string[] sub)

    {

        double avg = 0;

        for (int x = 0; x < top; x++)

        {

            for (int y = 0; y < bot; y++)

            {

                avg = avg + array[x, y];

            }

​

            avg = avg / bot;

            Console.WriteLine($"{sub[x]} average is {avg}");

            avg = 0;

        }

    }

    public static void displayTable(string [] sub, string [] student, int [,] grade)

    {

        int rowLength = grade.GetLength(0);

        int colLength = grade.GetLength(1);

​

        for (int i = 0; i < rowLength; i++)

        {

            for (int j = 0; j < colLength; j++)

            {

                Console.Write(string.Format("{0} ", grade[i, j]));

            }

            Console.Write(Environment.NewLine + Environment.NewLine);

        }

        Console.ReadLine();

    }

    public static void makeNewList()

    {

        Console.WriteLine("How Many Students? ");

        int studentNum = int.Parse(Console.ReadLine());

        Console.WriteLine("How Many Subjects?");

        int subjectNum = int.Parse(Console.ReadLine());

        string []subject = new string[subjectNum];

        string [] student = new string[studentNum];

        int [,] studentGrade = new int[studentNum, subjectNum];

                for (int x = 0; x < studentNum; x++)

                {

                    Console.WriteLine($"Enter Student: ");

                    student[x] = (Console.ReadLine());

                }

​

                for (int y = 0; y < subjectNum; y++)

                {

                    Console.WriteLine($"Enter Subject: ");

                    subject[y] = Console.ReadLine();

                }

​

                for (int x = 0; x < studentNum; x++)

                {

                    for (int y = 0; y < subjectNum; y++)

                    {

                        while (true)

                        {

                            Console.WriteLine($"{student[x]}'s {subject[y]} Grade: ");

                            int ans = int.Parse(Console.ReadLine());

                            if (ans < 101 && ans > -1)

                            {

                                studentGrade[x, y] = ans;

                                break;

                            }

                            else

                                Console.WriteLine("Try Again");

                        }

                    }

                }   

    }

}