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CS 111 - Week 3 Lecture 2 - 2025-09-11
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TODAY WE WILL:
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*   announcements
*   remind: scene type
*   intro to 2htdp/universe function big-bang
*   prep for next class

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*   Data Science Club is starting up on
    Tuesday, September 16
    *   meeting Tuesdays
    *   BSS 317
    *   5:00 - 6:00 pm

*   CS Club - doing Code Golf - next Wednesday, September 17
    *   FR 105
    *   3 - 4:30 pm

*   (don't forget the Math Colloquia, also --
    typically tea at 3:30 pm,
    talk at 4:00 pm,
    BSS 302 - today, Brad Ballinger -
    One Mathematician Walks Two Dogs)

*   should be working on and submitting attempts
    at Homework 2 - at-least-first attempts are
    due by 11:59 pm tomorrow, Friday, September 12

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testing function check-within
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*   when testing functions involving fractional numbers,
    if a check-expect fails, you can see if check-within
    helps;
    
*   check-within still expects the expression to test
    and the expected value,
    BUT it also expects a 3rd argument, the margin of error

; this passes, because the values of (/ 1 3) and .33333333 are,
;     while not exact, still within .001 from each other

(check-within (/ 1 3)
              .33333333
	      .001)