01_grundlagen/uebungen/u29_fuehrende-nullen.html

@@ -26,12 +26,20 @@
             <li>007 =&gt; 007</li>
           </ul>
         </div>
+        <div class="output alert alert-secondary my-3"></div>
       </div>
     </main>
     <script>
       'use strict';
 
-      let itemNumber = '123';
+      const outputEl = document.querySelector('.output');
+
+      let itemNumber = prompt('Your itemNumber?');
+
+      let correctedItemNumber = itemNumber.charAt(0) === '0' ? itemNumber : '0' + itemNumber;
+
+      console.log(correctedItemNumber);
+      outputEl.textContent = correctedItemNumber;
     </script>
   </body>
 </html>