3D Game Programming for Kids, 2nd Edition

Sharing a Keyboard

The first bug has to do with powering up the launcher. If player #1 holds down the S key, the launcher powers up like normal. But, if player #2 then presses the K key, player #1’s power up stops.

This bug happens because there’s only one keyboard and keyboards expect that only one person is going to press and hold a key. If you press and hold the S key in a word processor, you’ll get a bunch of Ss in your document—the keyboard repeats the S letter. If you keep the S key down and then hold down the K key at the same time, the computer figures you now want a bunch of Ks added to the document, and switches to repeating the K key.

To make power-ups work when two people are sharing the keyboard, we need to replace keyboard repeats ...