/*

Full Name: Meida Lin

IU Username: ml54

Replit Username: meidalin

*/

​

using System;

public class Program

{

    public static void Main()

    {

​

    // The following block of code demostrates how to make use of the functions

    // defined in validate.cs. Start your assignment first running this code and 

    // paying attention how to use each function. These functions will save you

    // a lot of time for validating your input.

    // Comment out the folloing block with /* ... */

​

    /*

    {

      string[] Test = new string[] {

        "",

        "S308",

        "csharp",

        "0zero",

        "Esen Tuna",

        "...",

        "a@b.com",

        "000-000-0000",

        "(812) 555-4444",

        "812555666666"

      };

      foreach (string s in Test) {

        Console.WriteLine("NumericDigits: \"{0}\" is {1}", 

          s, 

          Validate.HasNumericDigits(s));

        Console.WriteLine("Email: \"{0}\" is {1}", 

          s, 

          Validate.IsValidEmail(s));

        string PhoneNumber;

        Console.WriteLine("Phone: \"{0}\" is {1}. out={2}", 

          s, 

          Validate.IsValidPhoneNumber(s, out PhoneNumber),

          PhoneNumber);

        Console.WriteLine();

      } 

      return; // Note that we stop our sample run here.

    }

   */

​

    // Data structures needed. 

    // Declare appropriate arrays of the given Capacity

    const int Capacity = 40;//declare the capacity 

      string[] LastName = new string[Capacity]; // declare array for last name

    string[] FirstName = new string[Capacity]; // declare array for first name

    string[] MiddleName = new string[Capacity]; // declare array for middle name

    string[] Phone = new string[Capacity]; // declare array for phone number

    string[] Email = new string[Capacity]; // declare array for email

    double[] GPA = new double [Capacity]; // declare array for gpa

​

    //declare the variable names for further use in the loop

    int count = 0;

    string input = "";

    string PhoneNumber;

    //start the do while loop for each student's information

    do

    {

        do

        {

            Console.Write("Last Name = ");//ask for input

            input = Console.ReadLine();

        } while (Validate.HasNumericDigits(input)); //not true when the input is number

        // User signals "done entering the list" with empty LastName.

        if (input == "") break;

​

        LastName[count] = input;    // record the last name

​

        do

        {

            Console.Write("First Name = "); //ask for input

            input = Console.ReadLine();

        } while (Validate.HasNumericDigits(input) || input == ""); // not true when the input is number

​

        FirstName[count] = input; //record the first name

​

        do

        {

            Console.Write("Middle Name = "); //ask for input 

            input = Console.ReadLine();

        } while (Validate.HasNumericDigits(input)); //same as previous names

        MiddleName[count] = input; //record the middle name

        do

        {

            Console.Write("Phone Number = "); //ask for input

            input = Console.ReadLine();

            if (Validate.IsValidPhoneNumber(input, out PhoneNumber)||input == "") break;

        } while(true);

​

        Phone[count] = input;

        do

        {

            Console.Write("Email = ");

            input = Console.ReadLine();

            if(Validate.IsValidEmail(input) || input == "") break;

        } while(true);

​

        Email[count] = input;

​

      do

        {

            Console.Write("GPA = ");

            input =Console.ReadLine();

            double number;

            if (Double.TryParse(input, out number) && number >= 0 && number <= 4) break;

        } while (true);

​

        GPA[count] = Convert.ToDouble(input);

        // Get the rest of the items about the person using a similar do-while,

        // like the one above for the Last Name

​

​

            count++;

        } while (count < Capacity);

​

    Console.WriteLine("{0,-20}{1,-20}{2,-25}{3,-5}", "Name", "Email", "Phone Number", "GPA");

    Console.WriteLine("====================================================================");

​

    // Print the table header

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

    {

        string name = String.Format("{0}, {1} {2}", LastName[i], FirstName[i], MiddleName[i]);

        string email = Email[i];

        int symbol = email.IndexOf("@"); //find the index of @

            string userName = email.Substring(0, symbol); //substring the username

            string domain = email.Substring(symbol + 1);

            int domainsplit = domain.IndexOf(".");

            string firstpart = domain.Substring(0, domainsplit);

            string secpart = domain.Substring(domainsplit + 1);

        string emailformat = String.Format("{0}@{1}.{2}", userName, firstpart, secpart);

        string tendigits = Phone[i];

        if(tendigits.Length == 10)

        {

            string areacode = tendigits.Substring(0,3);

            string prefix = tendigits.Substring(3,3);

            string lastfour = tendigits.Substring(6);

            string formatted = String.Format("({0}) {1}-{2}", areacode, prefix, lastfour);

      Console.WriteLine("{0,-20}{1,-20}{2,-25}{3,-5}", name, emailformat, formatted, GPA[i]);

​

        }

    // Create a formatted line of output with all the entries.

        // Keep track of tallies            

}

​

​

     double sum = 0; //assign the variable of sum for all student's GPA

    if (count > 0) 

    {

          for(int i = 0; i < GPA.Length; i++)

          {

            sum += GPA[i];

            }

      double AverageGPA = sum / count;

      double AverageResult = Math.Round(AverageGPA, 2);

      Console.WriteLine("There are {0} students with an average GPA of {1}", count, AverageResult);

    }

    else if (count == 0)

    {

      double AverageGPA = 0;

      Console.WriteLine("There are {0} students with an average GPA of {1}", count, AverageGPA);

    }

    /*double sum = 0;

    foreach(int i in GPA)

    {

      sum += GPA[i];

    }

​

    double AverageGPA = sum /GPA.Length;

    Console.WriteLine("There are {0} students with an average GPA of {1}", GPA.Length, AverageGPA);

    // Print any summary information after the table.

*/

  }

}