imperative-recitation.rkt

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0 0 17 3 52 #";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;"
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0 0 17 3 51 #"; Imperative Programming vs. Functional Programming"
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0 0 17 3 52 #";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;"
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0 0 24 29 1 #"\n"
0 0 17 3 49 #"; Vending machines (functions) can do two things:"
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0 0 17 3 39 #"; 1. RETURN items, after taking payment"
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#"; 2. Cause CHANGES (\"side effects\") - decreasing the stock,"
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0 0 17 3 41 #"; increasing the stored amount of profits"
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0 0 24 29 1 #"\n"
0 0 17 3 53 #"; Functional-style programs only do (1) and never (2)"
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0 0 17 3 52 #"; Imperative-style programs can do (1), (2), or both"
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#"; Suppose we have a vending machine with the following options:"
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0 0 17 3 23 #"; $1 -------- twix bars"
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0 0 17 3 24 #"; $2 ------------ chips "
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0 0 17 3 23 #"; $3 ------- beef jerky"
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0 0 17 3 20 #"; FUNCTIONAL EXAMPLE"
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0 0 17 3 34 #"; vend: number -> string or number"
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0 0 17 3 14 #"; does nothing"
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#"; If a function doesn't return any values, we say it returns void."
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0 0 17 3 30 #"; vend/broken : number -> void"
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0 0 17 3 48 #"; takes your money and EATS IT. NOTHING HAPPENS."
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0 0 17 3 37 #"; works normally, except for the twix"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 2 #" ("
0 0 14 3 16 #"vend/broken-twix"
0 0 24 3 1 #" "
0 0 14 3 7 #"payment"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 3 #"  ("
0 0 15 3 4 #"cond"
0 0 24 29 1 #"\n"
0 0 24 3 6 #"    [("
0 0 14 3 1 #"="
0 0 24 3 1 #" "
0 0 14 3 7 #"payment"
0 0 24 3 1 #" "
0 0 21 3 1 #"1"
0 0 24 3 6 #")     "
0 0 14 3 4 #"void"
0 0 24 3 1 #"]"
0 0 24 29 1 #"\n"
0 0 24 3 6 #"    [("
0 0 14 3 1 #"="
0 0 24 3 1 #" "
0 0 14 3 7 #"payment"
0 0 24 3 1 #" "
0 0 21 3 1 #"2"
0 0 24 3 3 #")  "
0 0 19 3 7 #"\"chips\""
0 0 24 3 1 #"]"
0 0 24 29 1 #"\n"
0 0 24 3 6 #"    [("
0 0 14 3 1 #"="
0 0 24 3 1 #" "
0 0 14 3 7 #"payment"
0 0 24 3 1 #" "
0 0 21 3 1 #"3"
0 0 24 3 3 #")  "
0 0 19 3 7 #"\"jerky\""
0 0 24 3 1 #"]"
0 0 24 29 1 #"\n"
0 0 24 3 5 #"    ["
0 0 14 3 4 #"else"
0 0 24 3 11 #"           "
0 0 14 3 7 #"payment"
0 0 24 3 3 #"]))"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 17 3 62
#";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 7          61 4           0 0           0 9 0 24 3 1 #"("
0 0 14 3 4 #"set!"
0 0 24 3 1 #" "
0 0 14 3 14 #"<VariableName>"
0 0 24 3 1 #" "
0 0 14 3 10 #"<NewValue>"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 17 3 37 #"; updates the value of <VariableName>"
0           0 0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 17 3 31 #"; Outside vending machine stock"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 1 #" "
0 0 14 3 18 #"outside-stock/twix"
0 0 24 3 1 #" "
0 0 21 3 1 #"2"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 1 #" "
0 0 14 3 19 #"outside-stock/chips"
0 0 24 3 1 #" "
0 0 21 3 1 #"2"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 1 #" "
0 0 14 3 19 #"outside-stock/jerky"
0 0 24 3 1 #" "
0 0 21 3 1 #"2"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 17 3 22 #"; stock-twix : -> void"
0 0 24 29 1 #"\n"
0 0 17 3 46 #"; decreases the number of twix in stock by one"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 2 #" ("
0 0 14 3 20 #"decrement/stock-twix"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 3 #"  ("
0 0 14 3 4 #"set!"
0 0 24 3 1 #" "
0 0 14 3 18 #"outside-stock/twix"
0 0 24 29 1 #"\n"
0 0 24 3 9 #"        ("
0 0 14 3 1 #"-"
0 0 24 3 1 #" "
0 0 14 3 18 #"outside-stock/twix"
0 0 24 3 1 #" "
0 0 21 3 1 #"1"
0 0 24 3 3 #")))"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 2 #" ("
0 0 14 3 21 #"decrement/stock-chips"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 3 #"  ("
0 0 14 3 4 #"set!"
0 0 24 3 1 #" "
0 0 14 3 19 #"outside-stock/chips"
0 0 24 29 1 #"\n"
0 0 24 3 9 #"        ("
0 0 14 3 1 #"-"
0 0 24 3 1 #" "
0 0 14 3 19 #"outside-stock/chips"
0 0 24 3 1 #" "
0 0 21 3 1 #"1"
0 0 24 3 3 #")))"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 2 #" ("
0 0 14 3 21 #"decrement/stock-jerky"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 3 #"  ("
0 0 14 3 4 #"set!"
0 0 24 3 1 #" "
0 0 14 3 19 #"outside-stock/jerky"
0 0 24 29 1 #"\n"
0 0 24 3 9 #"        ("
0 0 14 3 1 #"-"
0 0 24 3 1 #" "
0 0 14 3 19 #"outside-stock/jerky"
0 0 24 3 1 #" "
0 0 21 3 1 #"1"
0 0 24 3 3 #")))"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 17 3 39 #";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 7         121 4           0 0           0 19 0 24 3 1 #"("
0 0 15 3 5 #"begin"
0 0 24 29 1 #"\n"
0 0 24 3 2 #"  "
0 0 14 3 16 #"<FunctionCall#1>"
0 0 24 29 1 #"\n"
0 0 24 3 2 #"  "
0 0 14 3 16 #"<FunctionCall#2>"
0 0 24 29 1 #"\n"
0 0 24 3 2 #"  "
0 0 14 3 3 #"..."
0 0 24 29 1 #"\n"
0 0 24 3 2 #"  "
0 0 14 3 20 #"<ReturnFunctionCall>"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 17 3 54 #"; executes a sequence of function calls, one at a time"
0 0 24 29 1 #"\n"
0 0 17 3 35 #"; returns the value of the last one"
0           0 0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 17 3 49 #"; vend/outside-stock : number -> string or number"
0 0 24 29 1 #"\n"
0 0 17 3 56 #"; vends the item if one is in stock, else return payment"
0 0 24 29 1 #"\n"
0 0 17 3 59
#"; AN EXAMPLE OF SIDE EFFECTS AND INCONSISTENT RETURN VALUES"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 2 #" ("
0 0 14 3 18 #"vend/outside-stock"
0 0 24 3 1 #" "
0 0 14 3 7 #"payment"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 3 #"  ("
0 0 15 3 4 #"cond"
0 0 24 29 1 #"\n"
0 0 24 3 6 #"    [("
0 0 14 3 3 #"and"
0 0 24 3 2 #" ("
0 0 14 3 1 #"="
0 0 24 3 1 #" "
0 0 14 3 7 #"payment"
0 0 24 3 1 #" "
0 0 21 3 1 #"1"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 11 #"          ("
0 0 14 3 1 #">"
0 0 24 3 1 #" "
0 0 14 3 18 #"outside-stock/twix"
0 0 24 3 1 #" "
0 0 21 3 1 #"0"
0 0 24 3 5 #"))  ("
0 0 15 3 5 #"begin"
0 0 24 29 1 #"\n"
0 0 24 3 40 #"                                       ("
0 0 14 3 20 #"decrement-stock/twix"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 39 #"                                       "
0 0 19 3 6 #"\"twix\""
0 0 24 3 2 #")]"
0 0 24 29 1 #"\n"
0 0 24 3 6 #"    [("
0 0 14 3 3 #"and"
0 0 24 3 2 #" ("
0 0 14 3 1 #"="
0 0 24 3 1 #" "
0 0 14 3 7 #"payment"
0 0 24 3 1 #" "
0 0 21 3 1 #"2"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 11 #"          ("
0 0 14 3 1 #">"
0 0 24 3 1 #" "
0 0 14 3 19 #"outside-stock/chips"
0 0 24 3 1 #" "
0 0 21 3 1 #"0"
0 0 24 3 4 #")) ("
0 0 15 3 5 #"begin"
0 0 24 29 1 #"\n"
0 0 24 3 40 #"                                       ("
0 0 14 3 21 #"decrement-stock/chips"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 39 #"                                       "
0 0 19 3 7 #"\"chips\""
0 0 24 3 2 #")]"
0 0 24 29 1 #"\n"
0 0 24 3 4 #"    "
0 0 24 29 1 #"\n"
0 0 24 3 6 #"    [("
0 0 14 3 3 #"and"
0 0 24 3 2 #" ("
0 0 14 3 1 #"="
0 0 24 3 1 #" "
0 0 14 3 7 #"payment"
0 0 24 3 1 #" "
0 0 21 3 1 #"3"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 11 #"          ("
0 0 14 3 1 #">"
0 0 24 3 1 #" "
0 0 14 3 19 #"outside-stock/jerky"
0 0 24 3 1 #" "
0 0 21 3 1 #"0"
0 0 24 3 4 #")) ("
0 0 15 3 5 #"begin"
0 0 24 29 1 #"\n"
0 0 24 3 40 #"                                       ("
0 0 14 3 21 #"decrement-stock/jerky"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 39 #"                                       "
0 0 19 3 7 #"\"jerky\""
0 0 24 3 2 #")]"
0 0 24 29 1 #"\n"
0 0 24 3 4 #"    "
0 0 24 29 1 #"\n"
0 0 24 3 4 #"    "
0 0 17 3 65
#"; Refund payment if no matching item, or chosen item out of stock"
0 0 24 29 1 #"\n"
0 0 24 3 5 #"    ["
0 0 14 3 4 #"else"
0 0 24 3 1 #" "
0 0 14 3 7 #"payment"
0 0 24 3 3 #"]))"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 17 3 70
(
 #";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;"
 #";;"
) 0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 17 3 38 #"; sum-list : (listof number) -> number"
0 0 24 29 1 #"\n"
0 0 17 3 26 #"; sums a list imperatively"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 2 #" ("
0 0 14 3 8 #"sum-list"
0 0 24 3 1 #" "
0 0 14 3 3 #"lon"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 3 #"  ("
0 0 15 3 5 #"local"
0 0 24 3 3 #" [("
0 0 15 3 6 #"define"
0 0 24 3 1 #" "
0 0 14 3 3 #"sum"
0 0 24 3 1 #" "
0 0 21 3 1 #"0"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 10 #"          "
0 0 24 29 1 #"\n"
0 0 24 3 11 #"          ("
0 0 15 3 6 #"define"
0 0 24 3 1 #" "
0 0 14 3 9 #"remaining"
0 0 24 3 1 #" "
0 0 14 3 3 #"lon"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 10 #"          "
0 0 24 29 1 #"\n"
0 0 24 3 11 #"          ("
0 0 15 3 6 #"define"
0 0 24 3 2 #" ("
0 0 14 3 4 #"loop"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 13 #"            ("
0 0 14 3 2 #"if"
0 0 24 29 1 #"\n"
0 0 24 3 13 #"             "
0 0 17 3 43 #"; If remaining is an empty list, return sum"
0 0 24 29 1 #"\n"
0 0 24 3 14 #"             ("
0 0 14 3 6 #"empty?"
0 0 24 3 1 #" "
0 0 14 3 9 #"remaining"
0 0 24 3 2 #") "
0 0 14 3 3 #"sum"
0 0 24 29 1 #"\n"
0 0 24 3 13 #"             "
0 0 24 29 1 #"\n"
0 0 24 3 13 #"             "
0 0 17 3 14 #"; Otherwise..."
0 0 24 29 1 #"\n"
0 0 24 3 14 #"             ("
0 0 15 3 5 #"begin"
0 0 24 29 1 #"\n"
0 0 24 3 15 #"               "
0 0 17 3 32 #"; First, update the value of sum"
0 0 24 29 1 #"\n"
0 0 24 3 16 #"               ("
0 0 14 3 4 #"set!"
0 0 24 3 1 #" "
0 0 14 3 3 #"sum"
0 0 24 3 2 #" ("
0 0 14 3 1 #"+"
0 0 24 3 1 #" "
0 0 14 3 3 #"sum"
0 0 24 3 2 #" ("
0 0 14 3 5 #"first"
0 0 24 3 1 #" "
0 0 14 3 9 #"remaining"
0 0 24 3 3 #")))"
0 0 24 29 1 #"\n"
0 0 24 3 15 #"               "
0 0 17 3 33 #"; Next, update the remaining list"
0 0 24 29 1 #"\n"
0 0 24 3 16 #"               ("
0 0 14 3 4 #"set!"
0 0 24 3 1 #" "
0 0 14 3 9 #"remaining"
0 0 24 3 2 #" ("
0 0 14 3 4 #"rest"
0 0 24 3 1 #" "
0 0 14 3 9 #"remaining"
0 0 24 3 2 #"))"
0 0 24 29 1 #"\n"
0 0 24 3 15 #"               "
0 0 17 3 17 #"; Finally, repeat"
0 0 24 29 1 #"\n"
0 0 24 3 16 #"               ("
0 0 14 3 4 #"loop"
0 0 24 3 5 #"))))]"
0 0 24 29 1 #"\n"
0 0 24 3 4 #"    "
0 0 17 3 19 #"; Kick off the loop"
0 0 24 29 1 #"\n"
0 0 24 3 5 #"    ("
0 0 14 3 4 #"loop"
0 0 24 3 3 #")))"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 14 3 12 #"check-expect"
0 0 24 3 2 #" ("
0 0 14 3 8 #"sum-list"
0 0 24 3 2 #" ("
0 0 14 3 4 #"list"
0 0 24 3 1 #" "
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 2 #"))"
0 0 24 29 1 #"\n"
0 0 24 3 14 #"              "
0 0 21 3 1 #"6"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 17 3 71
(
 #";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;"
 #";;;"
) 0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 7          73 4           0 0           0 11 0 24 3 1 #"("
0 0 14 3 8 #"for-each"
0 0 24 3 1 #" "
0 0 14 3 4 #"proc"
0 0 24 3 1 #" "
0 0 14 3 3 #"lst"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 17 3 56 #"; like map because it applies proc to each lst item, but"
0 0 24 29 1 #"\n"
0 0 17 3 34 #"; doesn't return the resulting lst"
0           0 0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 17 3 48 #"; sum-list/for-each : (listof numbers) -> number"
0 0 24 29 1 #"\n"
0 0 17 3 26 #"; sums a list imperatively"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 15 3 6 #"define"
0 0 24 3 2 #" ("
0 0 14 3 17 #"sum-list/for-each"
0 0 24 3 1 #" "
0 0 14 3 3 #"lon"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 3 #"  ("
0 0 15 3 5 #"local"
0 0 24 3 2 #" ["
0 0 17 3 28 #"; Initialize the sum to zero"
0 0 24 29 1 #"\n"
0 0 24 3 11 #"          ("
0 0 15 3 6 #"define"
0 0 24 3 1 #" "
0 0 14 3 3 #"sum"
0 0 24 3 1 #" "
0 0 21 3 1 #"0"
0 0 24 3 2 #")]"
0 0 24 29 1 #"\n"
0 0 24 3 4 #"    "
0 0 24 29 1 #"\n"
0 0 24 3 5 #"    ("
0 0 15 3 5 #"begin"
0 0 24 29 1 #"\n"
0 0 24 3 6 #"      "
0 0 17 3 52 #"; Loop through the list, adding each item to the sum"
0 0 24 29 1 #"\n"
0 0 24 3 7 #"      ("
0 0 14 3 8 #"for-each"
0 0 24 3 2 #" ("
0 0 15 3 6 #"lambda"
0 0 24 3 2 #" ("
0 0 14 3 4 #"item"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 19 #"                  ("
0 0 14 3 4 #"set!"
0 0 24 3 1 #" "
0 0 14 3 3 #"sum"
0 0 24 3 2 #" ("
0 0 14 3 1 #"+"
0 0 24 3 1 #" "
0 0 14 3 3 #"sum"
0 0 24 3 1 #" "
0 0 14 3 4 #"item"
0 0 24 3 3 #")))"
0 0 24 29 1 #"\n"
0 0 24 3 16 #"                "
0 0 14 3 3 #"lon"
0 0 24 3 1 #")"
0 0 24 29 1 #"\n"
0 0 24 3 6 #"      "
0 0 24 29 1 #"\n"
0 0 24 3 6 #"      "
0 0 17 3 42 #"; After we're done looping, return the sum"
0 0 24 29 1 #"\n"
0 0 24 3 6 #"      "
0 0 14 3 3 #"sum"
0 0 24 3 3 #")))"
0 0 24 29 1 #"\n"
0 0 24 29 1 #"\n"
0 0 17 3 45 #"; Using for-each works the same way as before"
0 0 24 29 1 #"\n"
0 0 24 3 1 #"("
0 0 14 3 12 #"check-expect"
0 0 24 3 2 #" ("
0 0 14 3 17 #"sum-list/for-each"
0 0 24 3 2 #" ("
0 0 14 3 4 #"list"
0 0 24 3 1 #" "
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 2 #"))"
0 0 24 29 1 #"\n"
0 0 24 3 15 #"              ("
0 0 14 3 8 #"sum-list"
0 0 24 3 2 #" ("
0 0 14 3 4 #"list"
0 0 24 3 1 #" "
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 3 #")))"
0           0