Island 1 of 6 · 5 minutes

What is a computer, really?

Every computer plays the same game: In, Think, Out.

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The In-Think-Out game

A computer is a machine that plays one game all day long: something goes IN, the computer THINKS, and something comes OUT.

For grown-ups

This lesson introduces the input-process-output model and the idea of programs as exact instructions. The sandwich exercise is a classic 'exact instructions challenge' — letting the silly failures happen is the whole point, because it teaches why computers need precise instructions.