Rhymey's homework

Grades.cs

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

namespace ClassGrades
{
    class Program
    {

        public class Student
        {

            public Student()
            {
                Grades = new int[3];
            }

            public Student(int classCount)
            {
                Grades = new int[classCount];
            }

            int[] Grades;

            public void CollectGrades()
            {
                string input;
                int num;
                for (int i = 0; i < Grades.Length; i++)
                {
                    do
                    {
                        Console.Write("Enter grade for class {0}: ", i + 1);
                        input = Console.ReadLine();
                    } while (!int.TryParse(input, out num));
                    Grades[i] = num;
                }
            }

            public int GetAverage()
            {
                return (int)((float)GetTotal() / (float)Grades.Length);
            }

            public int GetTotal()
            {
                int total = 0;
                for (int i = 0; i < Grades.Length; i++)
                {
                    total += Grades[i];
                }
                return total;
            }

            public void PrintGrades()
            {
                for (int i = 0; i < Grades.Length; i++)
                {
                    Console.WriteLine("Class {0}: {1}", i + 1, Grades[i]);
                }
            }

        }

        static void Main(string[] args)
        {
            Student a = new Student(3);//Replace 3 with the number of classes
            Student b = new Student(3);

            Console.WriteLine("Input grades of student 1:");
            a.CollectGrades();

            Console.WriteLine();
            Console.WriteLine("Input grades of student 2:");
            b.CollectGrades();

            Console.WriteLine();
            Console.WriteLine("Student 1 grades:");
            a.PrintGrades();
            Console.WriteLine();
            Console.WriteLine("Student 1 total: {0}\nStudent 1 average: {1}", a.GetTotal(), a.GetAverage());

            Console.WriteLine();
            Console.WriteLine("Student 2 grades:");
            b.PrintGrades();
            Console.WriteLine();
            Console.WriteLine("Student 2 total: {0}\nStudent 2 average: {1}", b.GetTotal(), b.GetAverage());

            Console.WriteLine();
            Console.WriteLine("Overall total: {0}\nOverall average: {1}", a.GetTotal() + b.GetTotal(), (int)(((float)a.GetAverage() + (float)b.GetAverage()) / 2.0f));

            Console.ReadKey(true);

        }

    }
}