using System;

public class Program

{

    public static void Main()

    {

        string comand;

        Console.WriteLine("program for finding prime , even odd ,vowels and consonants , calculaor: ");

        Console.WriteLine (" \nenter your comand ( a , b )");

        Console.WriteLine ("\nfor calculator press {a} ");

        Console.WriteLine("for value status plate press {b} ");

        comand = Console.ReadLine();

        if (comand == "a")

        {

                int firstNum;

                int secondNum;                  

                string operation;

                int answer;

​

                Console.WriteLine("Hello, welcome to Alex's basic calculator!");

                Console.ReadLine();

​

                Console.Write("Enter the first number in your basic equation: ");

                firstNum = Convert.ToInt32(Console.ReadLine());                             

​

                //User input

                Console.Write("Now enter your second number in the basic equation: ");

                secondNum = Convert.ToInt32(Console.ReadLine());

                Console.Write("Ok now enter your operation ( x , / , +, -) ");

                operation = Console.ReadLine();

​

                if (operation == "x")

                {

                   answer = firstNum * secondNum;

                   Console.WriteLine(firstNum + " x " + secondNum + " = " + answer);

                   Console.ReadLine();

                }

                else if (operation == "/")

                {

                   answer = firstNum / secondNum;

                   Console.WriteLine(firstNum + " / " + secondNum + " = " + answer);

                   Console.ReadLine();

                }                                                                           

                // solution

                else if (operation == "+")

                {

                   answer = firstNum + secondNum;

                   Console.WriteLine(firstNum + " + " + secondNum + " = " + answer);

                   Console.ReadLine();

                }

                else if (operation == "-")

                {

                   answer = firstNum - secondNum;

                   Console.WriteLine(firstNum + " - " + secondNum + " = " + answer);

                   Console.ReadLine();

                }

                else

                {

                   Console.WriteLine("Sorry that is not correct format! Please restart!");    

                   Console.ReadLine();

                }

        }

        else if (comand == "b")

        {

            int i, m=0, flag=0; 

            char character;

            Console.WriteLine("THE VALUE STATUS PLATE SHOWS WHETHER \n      THE VALUE ENTERED IS AN \nALPHABET , PRIME ,EVEN OR AN ODD NUMBER ");

            Console.WriteLine("***************************************");

            Console.Write("\n\nEnter any value of your choice: ");                

            character = Char.Parse(Console.ReadLine());  

            if((character >= 'A' && character <= 'Z')||character >= 'a' && character <= 'z')

            {

                if (character == 'a' || character == 'A' || character == 'e' || character == 'E' 

                    || character == 'i'|| character == 'I' || character == 'o' || character == 'O'

                    || character == 'u' || character == 'U')

                {

                    Console.WriteLine(character + " is a vowel");

                }

                else

                {

                    Console.WriteLine(character + " is a consonant");

                }

            }

            else

            {

          Console.WriteLine(character + " is not an alphabet");             

          m = character/2;    

          for(i = 2; i <= m; i++)    

          {    

               if(character % i == 0)    

               {    

               Console.Write("\n Number is not Prime.");    

               flag=1;    

               break;    

               }    

          }    

               if (flag==0)    

               Console.Write("but it is a Prime number."); 

            };

             if ( character % 2 == 0)

             {

             Console.WriteLine("\nit is also an even integer");

             }

                 else 

                 {

                 Console.WriteLine("\n and also an odd integer");

                 }

        }

    }

}