;; CSE 413 23sp lecture 1 demo transcript

Welcome to DrRacket, version 8.8 [cs].
Language: racket, with debugging; memory limit: 128 MB.
> 17
17
> #t
#t
> "hello"
"hello"
> 1/3
1/3
> 5/3
1 2/3
> 0.33333333333333
0.33333333333333
> 1+2
. . 1+2: undefined;
 cannot reference an identifier before its definition
> (+ 1 2)
3
> (+ 1 2 3 4 5 6 7 8)
36
> (* 2 3 4)
24
> (/ 1 3)
1/3
> (/ 1.0 3.0)
0.3333333333333333
> +
#<procedure:+>
> (+ 1 2.0)
3.0
> (+ 1/3 2.0)
2.3333333333333335
> (define xvii 17)
> xvii
17
> (+ xvii 1)
18
> (+ xvii two)
. . two: undefined;
 cannot reference an identifier before its definition
> (define two 2)
> (+ xvii two)
19
> (define (twice n) (+ n n))
> (twice 2)
4
> (twice (twice (twice 2)))
16
>