mirror of https://gitee.com/XmacsLabs/planet.git
334 lines
6.4 KiB
Plaintext
334 lines
6.4 KiB
Plaintext
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<TeXmacs|2.1.2>
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<style|<tuple|generic|no-page-numbers|chinese>>
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<\body>
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<section*|Slide 2>
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<\session|scheme|default>
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<\unfolded-io|Scheme] >
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(+ 1 1)
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<|unfolded-io>
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2
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</unfolded-io>
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<\unfolded-io|Scheme] >
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(begin
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\ \ (+ 1 1)
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\ \ (+ 1 3))
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<|unfolded-io>
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4
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</unfolded-io>
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<\unfolded-io|Scheme] >
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(and (begin
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\ \ \ \ \ \ \ (debug-message "std" "branch 1\\n")
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\ \ \ \ \ \ \ #t)
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\ \ \ \ \ (begin
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\ \ \ \ \ \ \ (debug-message "std" "branch 2\\n")
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\ \ \ \ \ \ \ #t))
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<|unfolded-io>
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#t
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</unfolded-io>
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<\unfolded-io|Scheme] >
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(or (begin
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\ \ \ \ \ \ \ (debug-message "std" "branch 1\\n")
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\ \ \ \ \ \ \ #t)
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\ \ \ \ \ (begin
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\ \ \ \ \ \ \ (debug-message "std" "branch 2\\n")
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\ \ \ \ \ \ \ #f))
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<|unfolded-io>
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#t
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</unfolded-io>
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<\input|Scheme] >
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\;
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</input>
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</session>
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<section*|Slide 3>
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<\session|scheme|default>
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<\unfolded-io|Scheme] >
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(define result 0)
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<|unfolded-io>
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0
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</unfolded-io>
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<\input|Scheme] >
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(for (x (list 1 2 3 4))
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\ \ (set! result (+ result x)))
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</input>
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<\unfolded-io|Scheme] >
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result
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<|unfolded-io>
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10
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</unfolded-io>
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<\unfolded-io|Scheme] >
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(define (range n)
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\ \ (if (\<less\>= n 0)
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\ \ \ \ \ \ (list )
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\ \ \ \ \ \ (append (range (- n 1)) (list n))))
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<|unfolded-io>
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range
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</unfolded-io>
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<\unfolded-io|Scheme] >
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(range 5)
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<|unfolded-io>
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(1 2 3 4 5)
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</unfolded-io>
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<\unfolded-io|Scheme] >
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(define (sigma1 n)
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\ \ (define result1 0)
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\ \ (for (i (range n))
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\ \ \ \ (set! result1 (+ result1 i)))
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\ \ result1)
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<|unfolded-io>
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sigma1
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</unfolded-io>
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<\unfolded-io|Scheme] >
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(sigma1 100)
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<|unfolded-io>
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5050
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</unfolded-io>
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<\input|Scheme] >
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\;
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</input>
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</session>
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<\session|scheme|default>
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<\unfolded-io|Scheme] >
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(define (sigma2 n)
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\ \ (if (= n 0)
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\ \ \ \ \ \ 0
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\ \ \ \ \ \ (+ n (sigma2 (- n 1))))); tail recursive
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<|unfolded-io>
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sigma2
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</unfolded-io>
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<\unfolded-io|Scheme] >
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(sigma2 100)
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<|unfolded-io>
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5050
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</unfolded-io>
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<\input|Scheme] >
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\;
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</input>
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</session>
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<section*|Slide 4>
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<\session|scheme|default>
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<\unfolded-io|Scheme] >
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(define (sum start end)
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\ \ (cond ((\<gtr\> start end) 0)
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\ \ \ \ \ \ \ \ ((= start end) end)
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\ \ \ \ \ \ \ \ (else (+ start
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\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ (sum (+ start 1) end)))))
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<|unfolded-io>
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sum
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</unfolded-io>
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<\unfolded-io|Scheme] >
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(sum 2 100)
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<|unfolded-io>
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5049
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</unfolded-io>
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<\input|Scheme] >
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\;
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</input>
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</session>
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<section*|Slide 5>
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<\session|scheme|default>
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<\unfolded-io|Scheme] >
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(define (fib n)
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\ \ (cond ((= n 0) 0)
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\ \ \ \ \ \ \ \ ((= n 1) 1)
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\ \ \ \ \ \ \ \ (else (+ (fib (- n 1))
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\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ (fib (- n 2))))))
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<|unfolded-io>
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fib
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</unfolded-io>
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<\unfolded-io|Scheme] >
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(fib 2)
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<|unfolded-io>
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1
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</unfolded-io>
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<\unfolded-io|Scheme] >
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(fib 4)
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<|unfolded-io>
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3
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</unfolded-io>
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<\unfolded-io|Scheme] >
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(stree-\<gtr\>tree
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\ '(tree "fib 2"
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\ \ \ \ \ \ \ \ (tree "fib 1" (tree 1))
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\ \ \ \ \ \ \ \ (tree "fib 0" (tree 0))))
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<|unfolded-io>
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<text|<tree|fib 2|<tree|fib 1|<tree|1>>|<tree|fib 0|<tree|0>>>>
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</unfolded-io>
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<\input|Scheme] ;>
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scheme tree \<#2018\>'
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</input>
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</session>
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\;
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<tree|f 5|f 4|f 3>
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<section*|Slide 6>
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<\session|scheme|default>
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<\unfolded-io|Scheme] >
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(define (fib2 n)
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\ \ (define a 0)
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\ \ (define b 1)
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\ \ (define old_b 0)
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\ \ (for (i (range n))
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\ \ \ \ (set! old_b b)
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\ \ \ \ (set! b (+ a b))
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\ \ \ \ (set! a old_b))
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\ \ a)
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<|unfolded-io>
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fib2
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</unfolded-io>
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<\unfolded-io|Scheme] >
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(fib2 2)
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<|unfolded-io>
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1
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</unfolded-io>
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<\input|Scheme] >
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\;
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</input>
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</session>
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<\session|scheme|default>
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<\unfolded-io|Scheme] >
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(define (fib3 n)
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\ \ (define (fib_ab n a b)
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\ \ \ \ (if (\<less\>= n 0)
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\ \ \ \ \ \ \ \ a
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\ \ \ \ \ \ \ \ (fib_ab (- n 1) b (+ a b))))
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\ \ (fib_ab n 0 1))
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<|unfolded-io>
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fib3
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</unfolded-io>
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<\unfolded-io|Scheme] >
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(fib3 -1)
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<|unfolded-io>
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0
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</unfolded-io>
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<\input|Scheme] >
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\;
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</input>
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</session>
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</body>
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<\initial>
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<\collection>
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<associate|font-base-size|8>
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<associate|page-screen-margin|true>
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</collection>
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</initial>
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<\references>
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<\collection>
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<associate|auto-1|<tuple|?|?>>
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<associate|auto-2|<tuple|?|?>>
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<associate|auto-3|<tuple|?|?>>
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<associate|auto-4|<tuple|?|?>>
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<associate|auto-5|<tuple|?|?>>
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</collection>
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</references>
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<\auxiliary>
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<\collection>
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<\associate|toc>
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<vspace*|1fn><with|font-series|<quote|bold>|math-font-series|<quote|bold>|Slide
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2> <datoms|<macro|x|<repeat|<arg|x>|<with|font-series|medium|<with|font-size|1|<space|0.2fn>.<space|0.2fn>>>>>|<htab|5mm>>
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<no-break><pageref|auto-1><vspace|0.5fn>
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<vspace*|1fn><with|font-series|<quote|bold>|math-font-series|<quote|bold>|Slide
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3> <datoms|<macro|x|<repeat|<arg|x>|<with|font-series|medium|<with|font-size|1|<space|0.2fn>.<space|0.2fn>>>>>|<htab|5mm>>
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<no-break><pageref|auto-2><vspace|0.5fn>
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<vspace*|1fn><with|font-series|<quote|bold>|math-font-series|<quote|bold>|Slide
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4> <datoms|<macro|x|<repeat|<arg|x>|<with|font-series|medium|<with|font-size|1|<space|0.2fn>.<space|0.2fn>>>>>|<htab|5mm>>
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<no-break><pageref|auto-3><vspace|0.5fn>
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<vspace*|1fn><with|font-series|<quote|bold>|math-font-series|<quote|bold>|Slide
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5> <datoms|<macro|x|<repeat|<arg|x>|<with|font-series|medium|<with|font-size|1|<space|0.2fn>.<space|0.2fn>>>>>|<htab|5mm>>
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<no-break><pageref|auto-4><vspace|0.5fn>
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<vspace*|1fn><with|font-series|<quote|bold>|math-font-series|<quote|bold>|Slide
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6> <datoms|<macro|x|<repeat|<arg|x>|<with|font-series|medium|<with|font-size|1|<space|0.2fn>.<space|0.2fn>>>>>|<htab|5mm>>
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<no-break><pageref|auto-5><vspace|0.5fn>
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</associate>
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</collection>
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</auxiliary>
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