To run:
Start up.
Demonstrate breaking.
Wait for the escape key.
Shut down.

To demonstrate breaking:
Pick a number between 0 and 19.
Write the number to the console.
If the number is 10, break.
Pick another number between 0 and 19.
Write the other number to the console.
Repeat.

To write a number to the console:
Convert the number to a string.
Write the string to the console.