This is a fork in the road. If the answer isn't 20, the machine "jumps" to a completely different section of code.

Before you look at the code, you look at your tools. Your workbench has a few small slots to hold data while you work. In x86, these are your : EAX: Your primary calculator.

Imagine you are a . You’ve just discovered a strange, ancient-looking machine in a high-tech bunker. It’s still running, but there are no manuals, no source code, and no labels on the buttons.