Download Computer Science Logo Style (Volume 1: Symbolic Computing) by Brian Harvey PDF

By Brian Harvey

This sequence is for people--adults and teenagers--who have an interest in machine programming simply because it's enjoyable. the 3 volumes use the brand programming language because the car for an exploration of machine technology from the point of view of symbolic computation and synthetic intelligence. emblem is a dialect of Lisp, a language utilized in the main complicated examine initiatives in desktop technological know-how, in particular in synthetic intelligence. during the sequence, sensible programming innovations (including greater order capabilities and recursion) are emphasised, yet conventional sequential programming can also be used while applicable. within the moment variation, the 1st volumes were rearranged in order that illustrative case reports seem with the options they exhibit. quantity 1 incorporates a new bankruptcy approximately better order capabilities, and the recursion chapters were reorganized for better readability. quantity 2 incorporates a new instructional bankruptcy approximately macros, an particular potential of Berkeley emblem, and new tasks. in the course of the sequence, the bigger software examples were rewritten for better clarity by way of extra wide use of knowledge abstraction. quantity 1 Symbolic Computing, is addressed to a reader who has used desktops and desires to profit the tips at the back of them. Symbolic computing is the manipulation of phrases and sentences, against this either to the portraits most folk go together with emblem and to the numerical computation with which extra conventional languages akin to Pascal and C++ are so much cozy. This quantity is celebrated for its transparent and thorough presentation of recursion, a key inspiration in laptop technological know-how that different texts deal with as arcane and hard. the emblem courses in those books and the author's loose Berkeley brand interpreter can be found through the net or on diskette.

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Extra info for Computer Science Logo Style (Volume 1: Symbolic Computing)

Example text

For Logo programming the answer is much simpler. In the end, your instructions and the procedures they invoke must be defined in terms of the primitive procedures. Those procedures are not made up of Logo instructions. They’re the things that Logo just knows how to do in the first place. Evaluation Now try this instruction: print sum 2 3 If everything is going according to plan, Logo didn’t print the words “sum 2 3”; it printed the number 5. The input to print was the expression sum 2 3, but Logo evaluated the input before passing it to the print procedure.

The output from word is a word formed by concatenating the characters in the input words: ? print word hellogoodbye ? print word nowhere ? print word word doesn’t "hello "goodbye "now "here "this [is a test] like [is a test] as input Selectors and constructors can be composed, in the same way we composed sum and product earlier. See if you can work out what this example will do before you try it with the computer:* * The tilde (~) at the end of the first line is the notation used by Berkeley Logo to indicate that this and the following line should be understood as a single, long instruction line.

Its inputs can be any data; its output is a list whose members are the inputs—not the members of the inputs, as for sentence. print list [this is] [a test] [this is] [a test] ? print list "this [is one too] this [is one too] ? print list [] [list of words] [] [list of words] Word is an operation that takes two inputs. Both inputs must be words. ) The output from word is a word formed by concatenating the characters in the input words: ? print word hellogoodbye ? print word nowhere ? print word word doesn’t "hello "goodbye "now "here "this [is a test] like [is a test] as input Selectors and constructors can be composed, in the same way we composed sum and product earlier.

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