Add Palindromic Number in C# (#4513)

Author: maple-johnson

archive/c/c-sharp/PalindromicNumber.cs

@@ -0,0 +1,51 @@
+using System;
+public class PalindromicNumber
+{
+    public static void Main(string[] args)
+    {
+
+        try
+        {
+            long verifyInput = long.Parse(args[0]);
+
+            if (verifyInput >= 0)
+            {
+                Console.WriteLine(palindrome(args[0]));
+            }
+            else
+            {
+                Console.WriteLine("Usage: please input a non-negative integer");
+            }
+
+        }
+        catch
+        {
+            Console.WriteLine("Usage: please input a non-negative integer");
+        }
+
+    }
+
+    public static string palindrome(string numString)
+    {
+        char[] digits = numString.ToCharArray();
+
+        int backCount = digits.Length - 1;
+
+        for (int i = 0; i < digits.Length; i++)
+        {
+            if (digits[i] != digits[backCount])
+            {
+                return "false";
+            }
+            else
+            {
+                backCount--;
+            }
+
+        }
+
+        return "true";
+
+    }
+
+}