Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Span is a programming language targeting the Parrot virtual machine. Its syntax is meant to be very similar to C, but its philosophy is Smalltalk-like, and it uses Smalltalk-style message syntax. Almost all of Span's library visible to the user is written in Span itself. A programming language is an artificial language designed to express computations that can be performed by a machine, particularly a computer. Programming languages can be used to create programs that control the behavior of a machine, to express algorithms precisely, or as a mode of human communication.

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