By David S. Touretzky

A hugely obtainable advent to LISP, this can be for green programmers and programmers new to LISP. A LISP "toolkit" in every one bankruptcy explains the way to use universal LISP programming and debugging instruments equivalent to DESCRIBE, check out, hint and STEP.

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Additional info for Common Lisp: A Gentle Introduction to Symbolic Computation

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Write a predicate NOT-ONEP that returns T if its input is anything other than one. 16. Write the predicate NOT-PLUSP that returns T if its input is not greater than zero. 17. Some earlier Lisp dialects did not have the EVENP primitive; they only had ODDP. Show how to define EVENP in terms of ODDP. 18. Under what condition does this predicate function return T? 19. What result does the function below produce when given the input NIL? What about the input T? Will all data flow through this function unchanged?

The computer’s internal representation of the list (RED GREEN BLUE) is drawn this way:** NIL RED GREEN BLUE Looking at the rightmost cell, you’ll note that the cons cell chain ends in NIL. This is a convention in Lisp. It may be violated in some circumstances, but most of the time lists will end in NIL. When the list is written in parenthesis notation, the NIL at the end of the chain is omitted, again by convention. 1. Show how the list (TO BE OR NOT TO BE) would be represented in computer memory by drawing its cons cell representation.

So the result of CDR is a pointer to the list (BIG BOPPER). From this example you can see that CAR is the same 44 Common Lisp: A Gentle Introduction to Symbolic Computation as FIRST, and CDR is the same as REST. Lisp programmers usually prefer to express it the other way around: FIRST returns the CAR of a list, and REST returns the CDR. 1 The CDR of a Single-Element List We saw previously that the list (AARDVARK) is not the same thing as the symbol AARDVARK. The list (AARDVARK) looks like this: NIL AARDVARK Since a list of length one is represented inside the computer as a single cons cell, the CDR of a list of length one is the list of length zero, NIL.

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