Program.cs

using System;
using System.IO;

namespace MIDTERM_HANDS_ON
{
    class Program
    {
        static void Main()
        {
            string fileName = "grade.txt";
            PrintStudentGrades(fileName);
            double averageGrade = CalculateAverageGrade(fileName);
            Console.WriteLine($"Average Grade: {averageGrade:F2}");
        }

        static double CalculateAverageGrade(string fileName)
        {
            double totalGrades = 0;
            int studentCount = 0;

            try
            {
                string[] lines = File.ReadAllLines(fileName);

                foreach (string line in lines)
                {
                    string[] parts = line.Split(' ');
                    if (parts.Length == 2)
                    {
                        double grade = Convert.ToDouble(parts[1]);
                        totalGrades += grade;
                        studentCount++;
                    }
                }

                if (studentCount == 0)
                {
                    throw new InvalidOperationException("No students in the file.");
                }

                return totalGrades / studentCount;
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error: {ex.Message}");
                return 0;
            }
        }

        static void PrintStudentGrades(string fileName)
        {
            Console.WriteLine("Student Grades:");

            try
            {
                string[] lines = File.ReadAllLines(fileName);

                foreach (string line in lines)
                {
                    string[] parts = line.Split(' ');
                    if (parts.Length == 2)
                    {
                        string studentName = parts[0];
                        string grade = parts[1];
                        Console.WriteLine($"{studentName}: {grade}");
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error: {ex.Message}");
            }
        }
    }
}