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Learning Processing by Daniel Shiffman

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Chapter 4. Variables

 

“All of the books in the world contain no more information than is broadcast as video in a single large American city in a single year. Not all bits have equal value.”

 
 --Carl Sagan
 

“Believing oneself to be perfect is often the sign of a delusional mind.”

 
 --Lieutenant Commander Data

In this chapter:

  • Variables: What are they?

  • Declaring and initializing variables.

  • Common uses for variables.

  • Variables you get “for free” in Processing (AKA “built-in” variables).

  • Using random values for variables.

What is a Variable?

I admit it. When I teach programming, I launch into a diatribe of analogies in an attempt to explain the concept of a variable in an intuitive manner. On any given day, I might say “A variable is like a bucket.” You put ...

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