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Understanding Mutable Variables in Programming

Variables in programming are pieces of storage that hold values. Learn about mutable variables, their use, and examples in ALICE programming. Explore how to track values, counters, and changes with variables.

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Understanding Mutable Variables in Programming

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  1. Variables – Chapter 10

  2. Mutable Variables • A piece of storage that holds a value (piece of information) while a program is running • Name • Unique • Cannot be changed • Data Type • Can be changed (mutable)

  3. Use of Variables • Keep track of Values • Counters • Number of times something has happened • Keep track of Changes • Position • Color

  4. In ALICE • Variable is a property that can be directly changed using a SET method • Added to the PROPERTIES list • Not directly visible within the ALICE world

  5. Example • Timer • Begin at Specified Time • Count down to 0 • Scorekeeper • Begins at zero • Increases the score when a player scores a point

  6. Sample Code • Create a world using the Hopping Bunny. The bunny should hope for 10 seconds with a timer counting down from 10 to 0.

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