CMPU-181, Spring 2013
Code from class (interactions)
Feb. 4, 2013


Welcome to DrScheme, version 4.2.1 [3m].
Language: Swindle; memory limit: 128 megabytes.
> (+ 2 3)
5
> +
#<procedure:+>
> *
#<procedure:*>
> -
#<procedure:->
> not
#<procedure:not>
> member
#<procedure:member>
> append
#<procedure:append>
> (1 2 3)
. . procedure application: expected procedure, given: 1; arguments were: 2 3
> (/ 2 3)
2/3
> (/ 2.0 3)
0.6666666666666666
> (define xyz (+ 2 30))
> xyz
32
> (+ xyz xyz)
64
> (+ (* 10 10) (* 50 40 (/ 73 21.)))
7052.380952380952
> (cos (/ 3.14159 4))
0.7071072502792263
> (1 2 3)
. . procedure application: expected procedure, given: 1; arguments were: 2 3
> '(1 2 3)
(1 2 3)
> (append '(1 2 3) '(4 5))
(1 2 3 4 5)
> (list 1 2 3 4 5 6)
(1 2 3 4 5 6)
> (list 1 (+ 2 3) (* 10 10) 5 6)
(1 5 100 5 6)
> (list xyz xyz)
(32 32)
> (list 'xyz xyz)
(xyz 32)
> (list 'xyz '(+ 2 3))
(xyz (+ 2 3))
> (lambda (x)
    (* x x))
#<procedure>
> (lambda (x) x)
#<procedure>
> (lambda (x) (* x x x))
#<procedure>
> (define square (lambda (x) (* x x)))
> square
#<procedure:square>
> (square 11)
121
> (square 1000)
1000000
> (square #t)
. . *: expects type <number> as 1st argument, given: #t; other arguments were: #t
>