add HW3 task 19 and 23

HomeWork.cs

@@ -3,6 +3,7 @@
     class HomeWork
     {
         int resaultHW;
+        private int counter;
         
         public void First_task()
         {
@@ -68,7 +69,6 @@
 
         public int Task_10(int number)
         {   
-//            if (number % 100 == 0)
             resaultHW  = number % 100 / 10;
             return resaultHW;
         }
@@ -98,6 +98,29 @@
             }
         }
 
+        public void Task_19(string number)
+        {   
+            bool isNumeric = int.TryParse(number, out int n);
+            if (number.Length != 5 || isNumeric is false)
+                Console.WriteLine("Number is wrong or not is number");
+            else
+            { 
+                string reverseNumber = string.Concat(number.Reverse());
+                Console.WriteLine(number == reverseNumber ? "YES" : "NO");   
+            }
+        }
+        
+        public void Task_23(int number)
+        {
+            counter = 1;
+            while (counter <= number)
+            {
+                int cube = counter * counter * counter;
+                Console.WriteLine($"{counter}^3 = {cube}");
+                counter++;
+            }
+        }
+
 
 
     }

README.md

@@ -11,3 +11,8 @@
 - [X] Task_10
 - [X] Task_13
 - [X] Task_15
+
+
+## HW3
+- [X] Task_19
+- [X] Task_23

Start.cs

@@ -19,12 +19,24 @@ public class Start
         }
     }
 
+    static void PrintNumberConsole()
+    {
+        Console.WriteLine("Input number: ");
+    }
+    
+    static int ReadIntNumber()
+    {
+        int number = Convert.ToInt32(Console.ReadLine());
+        return number;
+    }
+
     static void MyTask()
     {
         HomeWork HW = new HomeWork();
 
         Console.Write("Wich task: ");
         Console.WriteLine("WH2 is 10, 13, 15");
+        Console.WriteLine("WH3 is 19, 23");
         int taskNumver = Convert.ToInt32(Console.ReadLine());
         switch (taskNumver)
         {
@@ -44,18 +56,23 @@ public class Start
                 break;
             case 10:
                 Console.WriteLine("Input number: ");
-                int number10 = Convert.ToInt32(Console.ReadLine());
-                Console.WriteLine("Resault is: " + HW.Task_10(number10)); 
+                Console.WriteLine("Resault is: " + HW.Task_10(ReadIntNumber())); 
                 break;
             case 13:
                 Console.WriteLine("Input number: ");
-                int number13 = Convert.ToInt32(Console.ReadLine());
-                HW.Task_13(number13);
+                HW.Task_13(ReadIntNumber());
                 break;
             case 15:
                 Console.WriteLine("Input number of day: ");
-                int dateNumber = Convert.ToInt32(Console.ReadLine());
-                HW.Task_15(dateNumber);
+                HW.Task_15(ReadIntNumber());
+                break;
+            case 19:
+                PrintNumberConsole();
+                HW.Task_19(Console.ReadLine()); 
+                break;
+            case 23:
+                PrintNumberConsole();
+                HW.Task_23(ReadIntNumber());
                 break;
 
             default: