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CS3L: Introduction to Symbolic Programming

This lecture covers review topics, midterm announcements, mini-project requirements, and examples of interpreting symbolic expressions in programming. Topics include quiz reviews, midterm grades breakdown, and interpreting functions. <br>

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CS3L: Introduction to Symbolic Programming

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  1. CS3L: Introduction to Symbolic Programming Summer 2008 Colleen Lewis colleenL@berkeley.edu Lecture 7: Review

  2. Announcements • Midterm Thursday 9:10-11:10 • Open book / open note • Mini-Project Due Monday at 11:59 pm • Write both names and logins in the file • Only submit once • Ahmed Extra Office Hour 4-5

  3. More announcements • UCWise has planned outage Sundays from 8:00 am to 8:15 am • New Midterm Grade breakdown • Midterm 1 – 12% • Midterm 2 – 18% • Final – 20%

  4. Today • Go over yesterday’s quiz • Take today’s quiz • Go over today’s quiz • Work on the mini-project • Ask questions

  5. Write interpret… • (interpret ‘(+ 3 2)) -> 5 • (interpret ‘(- 4 7)) -> -3

  6. interpret ;; this expects x to be in the format ‘(+ # #) (define ( interpret x) (if (equal? (first x) ‘+) (+ (second x) (third x)) (- (second x) (third x))))

  7. Interpret ;; WRONG!!!! (define (interpret x) ((first x) (second x) (third x))) ;; Right… (define (interpret x) (eval x))

  8. Interpret (define (interpret x) ( (if (equal? (first x) ‘+ ) + - ) ;; become + or – (second x) (last x)))

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