STEP 15: Let's verify that our encryption function actually worked by testing it.

• Run the program and enter a new message and key. Write down the key you use! (example: 5)
• Look at the stage and write down the encrypted message that you see.
• Run the program again. This time enter the encrypted message that you wrote down.
• For the key, enter the negative of the key you wrote down (example: -5). What are the results?

To navigate the page using the TAB key, first press ESC to exit the code editor.