Program.cs

using System;
using System.ComponentModel;
using System.Security.Cryptography.X509Certificates;

namespace C__Fundmelts_With_Almhady
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // The Console
            /*
            Console.Title = "C# Exercis";
            Console.ForegroundColor = ConsoleColor.Blue;
            Console.WriteLine("Hello");
            Console.BackgroundColor = ConsoleColor.Red;
            Console.WriteLine("World");
            Console.ForegroundColor = ConsoleColor.White;
            Console.BackgroundColor = ConsoleColor.Black;
            Console.ReadKey();*/



            // Declertion The Vairale
            // The First ===> string
            //  string printanything = "Hello wrold";
            /*string printanything;
             printanything = "Hello wrold";
          //  string printanything = default;
            Console.WriteLine(printanything);
             Console.WriteLine(printanything);
             Console.WriteLine(printanything);
             Console.WriteLine(printanything);

            */

            //==================================================================

            /*

            // The Second ===> Boolean

            bool IsAlive = false;
            Console.Write("The IsAvlive = ");
            Console.WriteLine(IsAlive);
            IsAlive = true;
            Console.Write("The IsAvlive = ");
            Console.WriteLine(IsAlive); 

             IsAlive = default;
            Console.Write("The IsAvlive = ");
            Console.WriteLine(IsAlive);
            IsAlive = default;
            Console.Write("The IsAvlive = ");
            Console.WriteLine(IsAlive);

            // The Opreator ^ , && , || , !with boolean
            bool boolean1 = true, boolean2 = false;

            // The First && , &


            // the &&===> true&&true= true,  false && false =false , false && true = false , true && fales=false
            // the &===> true & true = true,  false & false = false , false & true = false , true &fales = false

            /*bool Result1 = boolean1 & boolean2; 
            bool Result2 = boolean1 && boolean2;

            Console.Write("The Result1 = ");
            Console.WriteLine(Result1); 

            Console.Write("The Result1 = ");
            Console.WriteLine(Result2);*/

            // The Second || , |

            // the ||===> true || true = true,  false || false = false , false || true = true, true || fales = true
            // the ||===> true | true = true,  false | false = false , false | true = true, true | fales = true

            /* bool Result1 = boolean1 | boolean2;
             bool Result2 = boolean1 || boolean2;

             Console.Write("The Result1 = ");
             Console.WriteLine(Result1);

             Console.Write("The Result1 = ");
             Console.WriteLine(Result2);*/

            // The Thirde ! 


            /*  bool Result1 = !boolean1 ;
              bool Result2 =  !boolean2;

              Console.Write("The Result1 = ");
              Console.WriteLine(Result1);

              Console.Write("The Result1 = ");
              Console.WriteLine(Result2);*/

            // The Fourth ^ 


            // the ^ ===> true ^ true = true,  false ^ false = false , false ^ true = true, true ^ fales = true
            /* bool Result1 = boolean1 ^ boolean2;
             bool Result2 = boolean1 ^ boolean2;

             Console.Write("The Result1 = ");
             Console.WriteLine(Result1);

             Console.Write("The Result1 = ");
             Console.WriteLine(Result2); */

            // ==============================================================




            // The Third  Console.Read
            // SCVAlue
            /* int c = Console.Read();
            int c1= Console.Read();
            int c2= Console.Read();
            int c3= Console.Read();
             Console.WriteLine(c); 
             Console.WriteLine(c1); 
             Console.WriteLine(c2);
             Console.WriteLine(c3);*/

            // To The Enter Any Thing And Print it
            /*
            string c = Console.ReadLine();
            string c1 = Console.ReadLine();
            string c2 = Console.ReadLine();
            string c3 = Console.ReadLine();
            Console.WriteLine(c);
            Console.WriteLine(c1);
            Console.WriteLine(c2);
            Console.WriteLine(c3);*/

            // Progrm To Print The SCk For The Letters Form A To Z And The Number Form 1 To 10

            // int[,] num = new int[9,9];
            // int [,] Letter = new int [26,26];

            /*   Console.WriteLine("Enter The Numbers From 1 to 10:");
               for(int i=0;i<num.Length;i++)
               {
                   num[i,i] = Console.Read() ;
                   Console.WriteLine(num[i,i]);

               }*/
            /* Console.WriteLine("Enter The Numbers From 1 to 10:");
             for (int i=0;i<Letter.Length;i++)
             {
                 Letter[i,i] = Console.Read() ;
                 Console.WriteLine(Letter[i,i]);

             }*/

            //  ============================================

            // the fiveth Char

            /*   char letter = 'A';
               char b = '2';
             //  Console.WriteLine(letter);
             //  Console.WriteLine((int)letter);
               bool c = char.IsDigit(letter);
             //  Console.WriteLine(c);
             //  c = char.IsDigit('5');
              // Console.WriteLine(c);
               c = char.IsLetter(letter);
               Console.WriteLine(c);
               bool s = char.IsLetter(b);
               Console.WriteLine(s);
               //  c = char.IsLetter(x);
               //Console.WriteLine(c);*/


            //1- char.IsLetter

            /*  char a = 'a';
              bool x = char.IsLetter(a);
              Console.WriteLine(x);*/

            //2-char.IsDigit

            /*char a = '1';
            bool x = char.IsDigit(a);
            Console.WriteLine(x);*/

            // 3 - char.IsWhiteSpace

            /* char space = ' ';
             bool ishiteSpace = char.IsWhiteSpace(space);
             Console.WriteLine(ishiteSpace);*/

            //   4 - char.IsUpper;

            /*  char upperChar = 'A';
              bool isUpper = char.IsUpper(upperChar);
              Console.WriteLine(isUpper);*/

            //   5- char.IsLower;

            /* char lowerChar = 'a';
             bool islower = char.IsLower(lowerChar);
             Console.WriteLine(islower);*/

            //   6- char.ToUpper;

            /*   char lowerChar = 'a'; 
               char upper =  char.ToUpper(lowerChar);
               Console.WriteLine(upper); */


            //   7- char.ToLower;

            /*  char tolowerChar = 'A'; 
             char lower=  char.ToLower(tolowerChar);
             Console.WriteLine(lower); */

            //   8- char.IsPunctuation;

            /* char punctuationChar = ','; 
             bool ispunctuation=  char.IsPunctuation(punctuationChar);
             Console.WriteLine(ispunctuation);*/

            //   9- char.IsControl;

            /* char iscontrol = '\n';
             bool Control = char.IsControl(iscontrol);
             Console.WriteLine(Control);*/


            //   10- char.IsSymbol;

            /* char issymbol = '$';
             bool Symbol= char.IsSymbol(issymbol);
             Console.WriteLine(Symbol);*/

            //   11- char.MinValue;


            // Console.WriteLine(Char.MinValue);

            //   12- char.MaxValue;


            //  Console.WriteLine(char.MaxValue);

            // 13- Char.IsSurrogate

            /*  char issurrogate = '\udc00';
              bool isSurrogate = Char.IsSurrogate(issurrogate);
              Console.WriteLine(isSurrogate);*/


            //  The Function For char 
            // ==========================
            /* 1 - char.IsLetter          ====> if The The Value Is Letter 
             2 - char.IsDigit           ====> if The The Value Is number
             3 - char.IsWhiteSpace      ====> if The The Value Is space like ' '
             4 - char.IsUpper;          ====> if the letter small true
             5 - char.IsLower;          ====> if the letter big true 
             6 - char.ToUpper;          ====> if the letter small the letter become Big 
             7 - char.ToLower;          ====> if the letter big the letter become small 
             8 - char.IsPunctuation;    ====>  if value like ? , . ;  true
             9 - char.IsControl;        ====>  if value like Enter 
             10 - char.IsSymbol;        ====>  if value like @ # $ & * true
             11 - char.MinValue;        ====>  The a small value That char take it
             12 - char.MaxValue;        ====>  The a big value That char take it
             13 - Char.IsSurrogate
            ======================================*/

            //=======================================================


            // the sixth  The string 
            /* 
             * 
             * The Function for String 
             
           1- Length
           2- ToUpper
           3- ToLower
           4- StartsWit
           5- EndsWith
           6- Contains
           7- IndexOf
           8- Replace
            */


            //string name = "";
            //Console.Write("Enter Your Name : ");
            //name = Console.ReadLine();
            //Console.WriteLine($"Welcome {name} \n To Oure Companys' Websit");
            //Console.WriteLine($"The Length = {name.Length}");
            //Console.WriteLine($"Upper Case: {name.ToUpper()} ");
            //Console.WriteLine($"Upper Case: {name.ToLower()} ");
            //bool startswith = name.StartsWith("R");
            //Console.WriteLine(startswith);          
            //bool endswith = name.EndsWith("i");
            //Console.WriteLine(endswith); 
            //bool contain = name.Contains("NU",StringComparison.OrdinalIgnoreCase);
            //Console.WriteLine(contain); 

          //Console.WriteLine(name.IndexOf("NU",StringComparison.OrdinalIgnoreCase));
             // Console.WriteLine(name.Replace("AlNuaimi","Ayed",StringComparison.OrdinalIgnoreCase));
            
        }

            






    }
}