#reader(lib"read.ss""wxme")WXME0111 ## #| This file uses the GRacket editor format. Open this file in DrRacket version 8.14 or later to read it. 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93 -1 -1 0 1 0 0 0 0 0 0 0 0.0 1 1 1 1.0 0 116 0 1.0 0 0 0 0.0 -1 -1 2 48 #"drracket:check-syntax:unk-obligation-style-pref\0" 0 -1 1 #"\0" 1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 0.0 1 1 1 1.0 0 0 0 1.0 0 0 0 0.0 -1 -1 2 1 #"\0" 0 -1 1 #"\0" 1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 0.0 1 1 1 1.0 139 142 28 1.0 0 0 0 0.0 -1 -1 2 49 #"drracket:check-syntax:both-obligation-style-pref\0" 0 -1 1 #"\0" 1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 0.0 1 1 1 1.0 139 142 28 1.0 0 0 0 0.0 -1 -1 2 26 #"plt:htdp:test-coverage-on\0" 0 -1 1 #"\0" 1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 0.0 1 1 1 1.0 0 0 0 1.0 0 0 0 0.0 -1 -1 2 1 #"\0" 0 -1 1 #"\0" 1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 1 0 0 0 0.0 0 0 0 0.0 255 165 0 1.0 0 0 0 1.0 -1 -1 2 27 #"plt:htdp:test-coverage-off\0" 0 -1 1 #"\0" 1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 1 0 0 0 0.0 0 0 0 0.0 255 165 0 1.0 0 0 0 1.0 -1 -1 4 1 #"\0" 0 70 1 #"\0" 1.0 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 0 0 0 0.0 0 0 0 0.0 -1 -1 4 4 #"XML\0" 0 70 1 #"\0" 1.0 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 0 0 0 0.0 0 0 0 0.0 -1 -1 2 1 #"\0" 0 -1 1 #"\0" 1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 0.0 1 1 1 1.0 0 100 0 1.0 0 0 0 0.0 -1 -1 2 61 #"drracket:language name and memory use at top of interactions\0" 0 -1 1 #"\0" 1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 0.0 1 1 1 1.0 0 100 0 1.0 0 0 0 0.0 -1 -1 2 37 #"plt:module-language:test-coverage-on\0" 0 -1 1 #"\0" 1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 0.0 1 1 1 1.0 0 0 0 1.0 0 0 0 0.0 -1 -1 2 38 #"plt:module-language:test-coverage-off\0" 0 -1 1 #"\0" 1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 1 0 0 0 0.0 0 0 0 0.0 255 165 0 1.0 0 0 0 1.0 -1 -1 0 36 #"mrlib/syntax-browser:subtitle-color\0" 0 -1 1 #"\0" 1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 1 0 0 0 0.0 0 0 0 0.0 36 36 140 1.0 255 255 255 1.0 -1 -1 0 42 #"mrlib/syntax-browser:focused-syntax-color\0" 0 -1 1 #"\0" 1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 1 0 0 0 0.0 0 0 0 0.0 34 139 34 1.0 255 255 255 1.0 -1 -1 4 1 #"\0" 0 71 1 #"\0" 1.0 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 0 0 0 0.0 0 0 0 0.0 -1 -1 4 1 #"\0" 0 -1 1 #"\0" 1.0 0 -1 -1 -1 -1 -1 -1 1 0 0 0 0 0 0 0 0 0.0 1.0 1.0 1.0 1.0 0 0 255 1.0 0 0 0 0.0 -1 -1 4 1 #"\0" 0 71 1 #"\0" 1.0 0 -1 -1 -1 -1 -1 -1 1 0 0 0 0 0 0 0 0 0.0 1.0 1.0 1.0 1.0 0 0 255 1.0 0 0 0 0.0 -1 -1 50 1 #"\0" 0 71 1 #"\0" 1.0 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 0 0 0 0.0 0 0 0 0.0 -1 -1 0 1 #"\0" 0 -1 1 #"\0" 0 13 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 0 0 0 0.0 0 0 0 0.0 -1 -1 2 1 #"\0" 0 -1 1 #"\0" 0 13 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 0 0 0 0.0 0 0 0 0.0 -1 -1 0 639 0 4 3 85 (5 85 ;; The first three lines of this file were inserted by DrRacket. They record metadata ) 0 0 4 29 1 #"\n" 0 0 4 3 85 (6 85 ;; about the language level of this file in a form that our tools can easily process. ) 0 0 4 29 1 #"\n" 0 0 4 3 181 (7 181 #reader(lib "htdp-beginner-reader.ss" "lang")((modname 111lect01-1) (read-case-sensitive #t) (teachpacks ()) (htdp-settings #(#t constructor repeating-decimal #f #t none #f () #f))) ) 0 0 4 29 1 #"\n" 0 0 17 3 6 #";=====" 0 0 24 29 1 #"\n" 0 0 17 3 49 #"; Racket examples from CS 111 - Week 1 Lecture 2," 0 0 24 29 1 #"\n" 0 0 17 3 28 #"; cleaned up after class!" 0 0 24 29 1 #"\n" 0 0 17 3 20 #"; last modified: 202" 0 0 17 3 7 #"4-08-29" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 70 (8 70 ; this is a comment (anything from a semicolon to the end of the line) ) 0 0 24 29 1 #"\n" 0 0 17 3 43 #"; * comments are IGNORED by the computer!" 0 0 24 29 1 #"\n" 0 0 17 3 39 #"; * they are there for HUMANS to read" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 6 #";=====" 0 0 24 29 1 #"\n" 0 0 17 3 19 #"; data type: number" 0 0 24 29 1 #"\n" 0 0 17 3 39 #"; can have digits smushed together," 0 0 24 29 1 #"\n" 0 0 17 3 46 #"; optionally with a single . decimal point" 0 0 24 29 1 #"\n" 0 0 17 3 39 #"; optionally starting with a + or -" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 49 #"; these are all simple expressions of type number" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 21 3 2 #"27" 0 0 24 3 5 #" " 0 0 17 3 21 #"; I am also a comment" 0 0 24 29 1 #"\n" 0 0 21 3 1 #"2" 0 0 24 29 1 #"\n" 0 0 21 3 14 #"123456789.0111" 0 0 24 29 1 #"\n" 0 0 21 3 3 #"+27" 0 0 24 29 1 #"\n" 0 0 21 3 3 #"-27" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 58 #"; in BSL Racket, you can separate expressions using blanks" 0 0 24 29 1 #"\n" 0 0 17 3 25 #"; as well as newlines" 0 0 24 29 1 #"\n" 0 0 17 3 53 #"; below: eight simple expressions of data type number" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 21 3 1 #"1" 0 0 24 3 1 #" " 0 0 21 3 1 #"2" 0 0 24 3 1 #" " 0 0 21 3 1 #"3" 0 0 24 3 1 #" " 0 0 21 3 1 #"4" 0 0 24 3 1 #" " 0 0 21 3 1 #"5" 0 0 24 3 1 #" " 0 0 21 3 2 #"-7" 0 0 24 3 1 #" " 0 0 21 3 4 #"5555" 0 0 24 3 1 #" " 0 0 21 3 3 #".45" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 56 #"; this attempted simple expression below does NOT follow" 0 0 24 29 1 #"\n" 0 0 17 3 9 #"; the" 0 0 17 3 1 #" " 0 0 17 3 6 #"syntax" 0 0 17 3 1 #" " 0 0 17 3 4 #"ruls" 0 0 17 3 1 #" " 0 0 17 3 3 #"for" 0 0 17 3 1 #" " 0 0 17 3 1 #"a" 0 0 17 3 7 #" number" 0 0 17 3 1 #";" 0 0 24 29 1 #"\n" 0 0 17 3 55 #"; UNCOMMENT the line below (REMOVE the ;) and click run" 0 0 24 29 1 #"\n" 0 0 17 3 39 #"; to see the error message you get!" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 7 #"; 1.2.3" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 6 #";=====" 0 0 24 29 1 #"\n" 0 0 17 3 19 #"; data type: string" 0 0 24 29 1 #"\n" 0 0 17 3 49 #"; anything written in double quotes is considered" 0 0 24 29 1 #"\n" 0 0 17 3 47 #"; a simple expression literal of type string" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 46 #"; three simple expressions of data type string" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 19 3 5 #"\"moo\"" 0 0 24 29 1 #"\n" 0 0 19 3 21 #"\"Hello how are you ?\"" 0 0 24 29 1 #"\n" 0 0 19 3 3 #"\"oh" 0 0 19 29 1 #"\n" 0 0 19 3 8 #" does" 0 0 19 29 1 #"\n" 0 0 19 3 7 #" this" 0 0 19 29 1 #"\n" 0 0 19 3 6 #"work?\"" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 6 #";=====" 0 0 24 29 1 #"\n" 0 0 17 3 20 #"; data type: boolean" 0 0 24 29 1 #"\n" 0 0 17 3 63 #"; for BSL Racket: the two most-basic literal simple expressions" 0 0 24 29 1 #"\n" 0 0 17 3 20 #"; of" 0 0 17 3 1 #" " 0 0 17 3 4 #"type" 0 0 17 3 8 #" boolean" 0 0 24 29 1 #"\n" 0 0 17 3 21 #"; are" 0 0 17 3 1 #" " 0 0 17 3 5 #"#true" 0 0 17 3 1 #" " 0 0 17 3 3 #"and" 0 0 17 3 7 #" #false" 0 0 24 29 1 #"\n" 0 0 17 3 73 (9 73 ; BUT!!!! it also accepts true and #t for #true (considers true and #t to ) 0 0 24 29 1 #"\n" 0 0 17 3 40 #"; also have the value #true)" 0 0 24 29 1 #"\n" 0 0 17 3 75 (10 75 ; it also accepts false and #f for #false (consider false and #f to ) 0 0 24 29 1 #"\n" 0 0 17 3 40 #"; also have the value #false" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 64 #"; so - these are six simple expressions all of data type boolean" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 21 3 5 #"#true" 0 0 24 29 1 #"\n" 0 0 21 3 6 #"#false" 0 0 24 29 1 #"\n" 0 0 21 3 2 #"#t" 0 0 24 29 1 #"\n" 0 0 21 3 2 #"#f" 0 0 24 29 1 #"\n" 0 0 14 3 4 #"true" 0 0 24 29 1 #"\n" 0 0 14 3 5 #"false" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 6 #";=====" 0 0 24 29 1 #"\n" 0 0 17 3 18 #"; data type: image" 0 0 24 29 1 #"\n" 0 0 17 3 57 #"; you can paste in a copied .jpg or .png or .tiff or .svg" 0 0 24 29 1 #"\n" 0 0 17 3 16 #"; image into D" 0 0 17 3 39 #"rRacket and that is considered a simple" 0 0 24 29 1 #"\n" 0 0 17 3 28 #"; expression of type image" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 6 #";=====" 0 0 24 29 1 #"\n" 0 0 17 3 54 #"; I searched for \"dachshund small image\" in a browser," 0 0 24 29 1 #"\n" 0 0 17 3 57 #"; right-clicked on and copied the desired image in the" 0 0 24 29 1 #"\n" 0 0 17 3 25 #"; browser results," 0 0 24 29 1 #"\n" 0 0 17 3 52 #"; then clicked on DrRacket's Interactions window," 0 0 24 29 1 #"\n" 0 0 17 3 54 #"; and used control/command v to paste in the image!" 0 0 24 29 1 #"\n" 0 0 17 3 37 #"; (Edit menu -> Paste works, also)" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 2 273 21 1 #"\0" 2 -1.0 -1.0 0.0 0.0 0 131 500 (11 500 PNG  IHDRh IDATxtilu=Cͼc)fk6`7v7` 0` nCEK(*Y,|s3콖?R\$2323 kx׻޵rdž1l %r<ՖOዧc+~`GJQDJ¬xQ`6ݘsp8`Ey#灢=9b04l֙z3=l6}F K TqC);Kf-m8$ rڑGi` gByB4)R7Ѧ@ ! 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) 0 0 24 29 1 #"\n" 0 0 17 3 74 (146 74 ; * but there ARE some operations to compare expressions of other types; ) 0 0 24 29 1 #"\n" 0 0 17 3 18 #"; * FOR EXAMPLE:" 0 0 24 29 1 #"\n" 0 0 17 3 70 (147 70 ; string=? can be used to compare string expresssions, and returns ) 0 0 24 29 1 #"\n" 0 0 17 3 65 #"; whether its string argument expressions have the same value" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 24 3 1 #"(" 0 0 14 3 8 #"string=?" 0 0 24 3 1 #" " 0 0 19 3 5 #"\"moo\"" 0 0 24 29 1 #"\n" 0 0 24 3 11 #" (" 0 0 14 3 13 #"string-append" 0 0 24 3 1 #" " 0 0 19 3 3 #"\"m\"" 0 0 24 3 1 #" " 0 0 19 3 4 #"\"oo\"" 0 0 24 3 2 #"))" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 6 #";=====" 0 0 24 29 1 #"\n" 0 0 17 3 65 #"; and IF you add this module using the special require operation:" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 24 3 1 #"(" 0 0 15 3 7 #"require" 0 0 24 3 1 #" " 0 0 14 3 11 #"2htdp/image" 0 0 24 3 1 #")" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 53 #"; NOW you can use operations from this Racket module!" 0 0 24 29 1 #"\n" 0 0 17 3 30 #"; NOW I have image operations!" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 14 #"; for example:" 0 0 24 29 1 #"\n" 0 0 17 3 57 #"; the circle function expects a desired radius in pixels," 0 0 24 29 1 #"\n" 0 0 17 3 68 (148 68 ; the desired style expressed as a string: "solid" or "outline:, ) 0 0 24 29 1 #"\n" 0 0 17 3 74 (149 74 ; and a color (one option is to write a known color name as a string), ) 0 0 24 29 1 #"\n" 0 0 17 3 68 #"; and it returns an image depicting a circle image with that radius," 0 0 24 29 1 #"\n" 0 0 17 3 23 #"; style, and color!" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 24 3 1 #"(" 0 0 14 3 6 #"circle" 0 0 24 3 1 #" " 0 0 21 3 2 #"30" 0 0 24 3 1 #" " 0 0 19 3 6 #"\"solid" 0 0 19 3 1 #"\"" 0 0 24 3 1 #" " 0 0 19 3 6 #"\"cyan\"" 0 0 24 3 1 #")" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 63 #"; uncomment to see the error you get if you try to call it with" 0 0 24 29 1 #"\n" 0 0 17 3 39 #"; a \"bad\" color argument expression:" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 2 #";(" 0 0 17 3 6 #"circle" 0 0 17 3 5 #" 30 \"" 0 0 17 3 5 #"solid" 0 0 17 3 3 #"\" \"" 0 0 17 3 5 #"moo\")" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 14 #"; for example:" 0 0 24 29 1 #"\n" 0 0 17 3 47 #"; the above function expects one or more images" 0 0 24 29 1 #"\n" 0 0 17 3 58 #"; and returns a single image that is a vertical \"stack\"" 0 0 24 29 1 #"\n" 0 0 17 3 38 #"; of the image argument expressions" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 24 3 1 #"(" 0 0 14 3 5 #"above" 0 0 24 3 2 #" (" 0 0 14 3 6 #"circle" 0 0 24 3 1 #" " 0 0 21 3 2 #"30" 0 0 24 3 1 #" " 0 0 19 3 6 #"\"solid" 0 0 19 3 1 #"\"" 0 0 24 3 1 #" " 0 0 19 3 5 #"\"cyan" 0 0 19 3 1 #"\"" 0 0 24 3 1 #")" 0 0 24 29 1 #"\n" 0 0 24 3 8 #" (" 0 0 14 3 9 #"rectangle" 0 0 24 3 1 #" " 0 0 21 3 3 #"100" 0 0 24 3 1 #" " 0 0 21 3 2 #"30" 0 0 24 3 1 #" " 0 0 19 3 8 #"\"outline" 0 0 19 3 1 #"\"" 0 0 24 3 1 #" " 0 0 19 3 1 #"\"" 0 0 19 3 7 #"purple\"" 0 0 24 3 2 #"))" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 17 3 6 #";=====" 0 0 24 29 1 #"\n" 0 0 17 3 56 #"; You can read about more of the operations/functions in" 0 0 24 29 1 #"\n" 0 0 17 3 61 #"; the module 2htdp/image in the DrRacket documentation --" 0 0 24 29 1 #"\n" 0 0 17 3 35 #"; * go to the DrRacket Help menu," 0 0 24 29 1 #"\n" 0 0 17 3 49 #"; * select \"Racket Documentation\" near the top," 0 0 24 29 1 #"\n" 0 0 17 3 64 #"; * enter in 2htdp/image in the ...search manuals... textfield" 0 0 24 29 1 #"\n" 0 0 17 3 28 #"; in the top-left corner" 0 0 24 29 1 #"\n" 0 0 17 3 66 #"; ...and select the link to the 2htdp/image module's documentation" 0 0 24 29 1 #"\n" 0 0 17 3 20 #"; that results --" 0 0 24 29 1 #"\n" 0 0 17 3 68 #"; ...scroll through the index on the left-hand-side, it has links to" 0 0 24 29 1 #"\n" 0 0 17 3 66 #"; descriptions of the many functions in the 2htdp/image module!" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0 24 29 1 #"\n" 0 0