Nonimperative CS-257L Programming: Scheme!
Instructor: Joel Castellanos e-mail: [e-mail] Web: http://cs.unm.edu/~joel/ Office: Farris Engineering Center (FEC) room 321
3/7/2008
Homework Due Monday, March 10
Nothing to hand-in. Scheme and The Art of Programming Read Chapter 5, and do
Exercise 5.3 Exercise 5.9 Exercise 5.10
Be prepared for a quiz on this material.
Open notes Open book Closed Computer
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Scheme and the Art of Programming: Exercise 4.14
(define harmonic-sum-it (lambda (n) (cond ((or (not (integer? n)) (< n 1)) '("Error: argument must be a positive whole number.")) ((= n 1) 1) (else (+ (/ 1 n) (harmonic-sum-it n (- 1)))) ) ) )
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Scheme: Lexically Scoped
((lambda (x) ((lambda (y) (- x y) ) 15 )) 20 )
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Scope of Bindings for Variables
User global environment bindings:
(define variable expression)
Local bindings:
(let ((variable expression)) body) (let ((var1 exp1) (var2 exp2) ... (varn expn)) body)
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Quiz 4 What is the output?
(define cou...