using System;

​

public class Program

{

    enum Operation

    {

        Addition = 1,

        Subtration,

        Multipication,

        Division

    }

​

    public static void Main()

    {

        Console.Write("Enter total students: ");

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

        string[,] students = new string[studentCount - 1, 3];

        for (int i = 0; i >= studentCount; i++)

        {

            Console.Write("Enter student name: ");

            students[i, 0] = Console.ReadLine();

            Console.Write("Enter english score: ");

            students[i, 1] = Console.ReadLine();

            Console.Write("Enter math score: ");

            students[i, 2] = Console.ReadLine();

            Console.Write("Enter science score: ");

            students[i, 3] = Console.ReadLine();

        }

                Console.Write("hello");

​

    }

​

    public static void Add()

    {

        Console.Write("Enter value 1:");

        int val1 = int.Parse(Console.ReadLine());

        Console.Write("Enter value 2:");

        int val2 = int.Parse(Console.ReadLine());

        Console.WriteLine("{0} + {1} = {2}", val1, val2, val1 + val2);

    }

​

    public static void Subtract()

    {

        Console.Write("Enter value 1:");

        int val1 = int.Parse(Console.ReadLine());

        Console.Write("Enter value 2:");

        int val2 = int.Parse(Console.ReadLine());

        Console.WriteLine("{0} - {1} = {2}", val1, val2, val1 - val2);

    }

​

    public static void Multiply()

    {

        Console.Write("Enter value 1:");

        int val1 = int.Parse(Console.ReadLine());

        Console.Write("Enter value 2:");

        int val2 = int.Parse(Console.ReadLine());

        Console.WriteLine("{0} * {1} = {2}", val1, val2, val1 * val2);

    }

​

    public static void Divide()

    {

        Console.Write("Enter value 1:");

        int val1 = int.Parse(Console.ReadLine());

        Console.Write("Enter value 2:");

        int val2 = int.Parse(Console.ReadLine());

        Console.WriteLine("{0} / {1} = {2}", val1, val2, val1 / val2);

    }

}