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Code: The Hidden Language of Computer Hardware and Software by Charles Petzold

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Chapter 1. Best Friends

code (kōd) …

3.a. A system of signals used to represent letters or numbers in transmitting messages.

b. A system of symbols, letters, or words given certain arbitrary meanings, used for transmitting messages requiring secrecy or brevity.

4. A system of symbols and rules used to represent instructions to a computer…

The American Heritage Dictionary of the English Language

You're 10 years old. Your best friend lives across the street. In fact, the windows of your bedrooms face each other. Every night, after your parents have declared bedtime at the usual indecently early hour, you still need to exchange thoughts, observations, secrets, gossip, jokes, and dreams. No one can blame you. After all, the impulse to communicate is one ...

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