using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        string random = "ajrhbg";

        while (random.ToUpper() != "N")

        {

            start:

                Console.Clear();

            Console.WriteLine("How many test grades would you like to enter?");

            string sans = Console.ReadLine();

            int ans;

            if (int.TryParse(sans, out ans) && ans >= 0)

            {

                float[] testgrades = new float[ans];

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

                {

                    Console.WriteLine("Please enter your grade" + (i + 1));

                    string s = Console.ReadLine();

                    if (float.TryParse(s, out testgrades[i]) && testgrades[i] >= 0 && testgrades[i] <= 100)

                        ;

                    else

                    {

                        Console.WriteLine("Please enter an appropriate value. Press ENTER to go back.");

                        Console.ReadLine();

                        goto start;

                    }

                }

​

                Console.WriteLine("How many homework grades would you like to enter?");

                sans = Console.ReadLine();

                if (int.TryParse(sans, out ans) && ans > 0)

                {

                    float[] homeworkgrades = new float[ans];

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

                    {

                        Console.WriteLine("Please enter your grade" + (i + 1));

                        string s = Console.ReadLine();

                        if (float.TryParse(s, out homeworkgrades[i]) && homeworkgrades[i] >= 0 && homeworkgrades[i] <= 100)

                            ;

                        else

                        {

                            Console.WriteLine("Please enter an appropriate value. Press ENTER to go back.");

                            Console.ReadLine();

                            goto start;

                        }

                    }

​

                    Console.WriteLine("How many classwork grades would you like to enter?");

                    sans = Console.ReadLine();

                    if (int.TryParse(sans, out ans) && ans > 0)

                    {

                        float[] classworkgrades = new float[ans];

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

                        {

                            Console.WriteLine("Please enter your grade" + (i + 1));

                            string s = Console.ReadLine();

                            if (float.TryParse(s, out classworkgrades[i]) && classworkgrades[i] >= 0 && classworkgrades[i] <= 100)

                                ;

                            else

                            {

                                Console.WriteLine("Please enter an appropriate value. Press ENTER to go back.");

                                Console.ReadLine();

                                goto start;

                            }

                        }

​

                        Console.WriteLine("How many project grades would you like to enter?");

                        sans = Console.ReadLine();

                        if (int.TryParse(sans, out ans) && ans > 0)

                        {

                            float[] projectgrades = new float[ans];

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

                            {

                                Console.WriteLine("Please enter your grade" + (i + 1));

                                string s = Console.ReadLine();

                                if (float.TryParse(s, out projectgrades[i]) && projectgrades[i] >= 0 && projectgrades[i] <= 100)

                                    ;

                                else

                                {

                                    Console.WriteLine("Please enter an appropriate value. Press ENTER to go back.");

                                    Console.ReadLine();

                                    goto start;

                                }

                            }

​

                            Console.WriteLine("Your average for your test grades are: " + testgrades.Average() + "\nYour average for your classwork grades are: " + classworkgrades.Average() + "\nYour average for your homework grades are: " + homeworkgrades.Average() + "\nYour average for your project grades are: " + projectgrades.Average() + "\nYour weighted average is: " + ((testgrades.Average() * .5) + (classworkgrades.Average() * .15) + (homeworkgrades.Average() * .15) + (projectgrades.Average() * .20)));

                        }

                    }

                }

            }

​

            Console.WriteLine("Press 'n' to quit or press any other key to restart. Remember to enter in an appropriate value!");

            random = Console.ReadLine();

        }

    }

}