using System;

public class Program

{

    public static void Main()

    {

        string[] students = {"Alice", "Bob", "Sam", "Jack"};

        int[] MathMarks = {10, 15, 99, 2};

        int [] ProgMarks = {93, 16, 0, 88};

        Console.WriteLine("Select a student from the following: ");

        int i = 0;

        foreach(string student in students)

        {

            Console.WriteLine((i) + " " + student);

            i++;

        }

        Console.WriteLine();

        Console.Write("Selection: ");

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

        Console.WriteLine("Student Name: " + students[index]);

        Console.WriteLine("Student Math Mark: " + MathMarks[index]);

        Console.WriteLine("Student Programming Mark: " + ProgMarks[index]);

        Console.WriteLine("The Average marks for Maths is: " + AverageMarks(MathMarks).ToString("0.00"));

    }

    static double AverageMarks(int[] marks)

    {

        int sum = 0;

        for(int j = 0; j < marks.Length; j++)

        {

            sum += marks[j];

        }

        //Implicit conversion

        return (double)sum / marks.Length;

    }

}