Welcome to DrRacket, version 8.4 [cs].
Language: racket, with debugging [custom]; memory limit: 128 MB.
> 1
1
> 1.3
1.3
> 1/3
1/3
> #t
#t
> #f
#f
> "abc"
"abc"
> 'abc
'abc
> abc
. . abc: undefined;
 cannot reference an identifier before its definition
> 'abc
'abc
> (symbol->string 'abc)
"abc"
> abc$-1
. . abc$-1: undefined;
 cannot reference an identifier before its definition
> abc+cd
. . abc+cd: undefined;
 cannot reference an identifier before its definition
> 'abc+cd
'abc+cd
> (+ 1 2 3)
6
> '(1 2 3)
'(1 2 3)
> '(+ 1 2 3)
'(+ 1 2 3)
> '(+ - * /)
'(+ - * /)
> (cons 1 '(2 3 4))
'(1 2 3 4)
> (cons 1 (cons 2 (cons 3 '())))
'(1 2 3)
> (cons 3 '())
'(3)
> (list 1 2 'a #t)
'(1 2 a #t)
> (first (list 1 2 'a #t))
1
> (rest (list 1 2 'a #t))
'(2 a #t)
> (car (list 1 2 'a #t))
1
> (cdr (list 1 2 'a #t))
'(2 a #t)
> (cdr (cdr (list 1 2 'a #t)))
'(a #t)
> (car (cdr (cdr (list 1 2 'a #t))))
'a
> (caddr (list 1 2 'a #t))
'a
> (last (list 1 2 'a #t))
#t
> null
'()
> (cons 'a 'b)
'(a . b)
> '(a . b)
'(a . b)
> (cons 'abc 'efg)
'(abc . efg)
> '(a . (b . (c . d)))
'(a b c . d)
> '(a . (b . (c . (d . ()))))
     
'(a b c d)
> (length '(a . (b . (c . (d . ())))))
4
> '((a . b) . (c . d))
'((a . b) c . d)
> '((a . b) . (c . (d . ())))
'((a . b) c d)
>