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Welcome
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Inc
Intgrty
Preface
Part I
Chap 1
Chap 2
Chap 3
XEmacs
Chap 4
Chap 5
Chap 6
Chap 7
Chap 8
Chap 9
Part II
Chap 10
Chap 11
Chap 12
Chap 13
Chap 14
Chap 15
Chap 16
Chap 17
Chap 18
Chap 19
Chap 20
Chap 21
Chap 22
Chap 23
Part III
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Chap 32
| CHAPTER 13: PREDICATE FUNCTIONS - Corrections
-
- page 84, lines 3 - 4: Change
> (packagep (in-package 'test)) T to > (packagep (defpackage test)) T - page 85, line 16: Change function to number.
- page 86, line 18: Change return to be.
- Notes
-
- Do Exercises 13.1 - 13.3 to the extent you feel you need to in order to feel comfortable with these functions.
- Do Exercise 13.7, and then compare your definition with the one in Appendix A.
- Instead of doing Exercise 13.10, compare the behavior of the functions
null and not You should not be able to find a difference. - Create a file named
ch13.cl with the following contents: ----------------------- cut here ----------------------- ;;; 13.6 ;;; When lisp:<= is called on three or more arguments, ;;; it returns True in case ;;; ???, ;;; and False otherwise. ;;; 13.8 ;;; The value of (listp NIL) is ??? ;;; 13.9 The function definition is ??? ;;; 13.11 ;;; The value of (atom 'a) is ??? ;;; The value of (atom 5) is ??? ;;; The value of (atom '(a)) is ??? ;;; The value of (atom '()) is ??? ;;; The value of (atom "string") is ??? ----------------------- cut here ----------------------- Replace the question marks with your answers, and submit the file.
When you do Exercise 13.9 do not use lisp:consp in your definition. - as directed in Exercise 13.12, create the file
util.cl with the definition of the function elementp in it. Your defpackage form should look like (defpackage util (:export elementp)) and don't forget the in-package form.
Submit this file. - Do Exercises 13.13 and 13.14. Exercise 13.14 asks you to modify your definition of
variablep Instead of changing the definition that was already in your match.cl file, add the new definition at the end and comment out the old definition with the comment brackets #| and |# Your file will look partially like this: ;;; 12.2 #| (defun variablep ... ... ) |# ;;; 13.13 (defun match-element ... ... ) ;;; 13.14 (defun variablep ... ... ) Submit your revised match.cl - From now on, comment your function definitions in
match.cl or calculator.cl with the exercise for which you wrote the definition, so I will know when I review the file, even though you will be submitting several files with the same name. - Notice that you will be submitting three files for Chapter 13.
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