Add Palindromic Number in Dart (#4977)

Author: gangaasoonu

archive/d/dart/palindromic-number.dart

@@ -0,0 +1,27 @@
+//Issue 4971
+void main(List<String> args){
+  const String error_message= "Usage: please input a non-negative integer";
+  if (args.isEmpty){
+    print(error_message);
+    return;
+  }
+
+  try{
+    bool is_palindrome = true;
+    int num_needed = int.parse(args[0]);
+
+    if (num_needed.isNegative){
+      print(error_message);
+      return;
+    }
+ 
+   String original_string = num_needed.toString();
+   String reverse_string = original_string.split('').reversed.join('') ;
+   is_palindrome = (original_string == reverse_string);
+
+    print(is_palindrome);
+  }
+  catch(e){
+    print(error_message);
+  }
+}