Welcome to DrScheme, version 103.
Language: Graphical Full Scheme (MrEd) Custom.
3
> (- 1)
-1
> (- 3 2)
1
> (- 4 2 3)
-1
> (/ 0)
/: division by zero
> -1
-1
> 1/2
1/2
> (expt 13 400)
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> 0.0
0.0
> (/ 0.0)
+inf.0
> 1+2i
1+2i
> (/ 0.1)
10.0
> (* 1+2i (sqrt -1))
-2+1i
> (define (f a b) (+ a b))
WARNING: Interactions window is out of sync with the definitions window. Click Execute.
> 
----------------------------------------
(define (f a b) (+ a b))
----------------------------------------
Welcome to DrScheme, version 103.
Language: Graphical Full Scheme (MrEd) Custom.
> (f 1 2)
3
> (f 1 2 3)
procedure f: expects 2 arguments, given 3: 1 2 3
> (1 + 2)
procedure application: expected procedure, given: 1; arguments were: + 2
> +
+
> 1
1
> (zero? 0.0)
#t
> (zero? 0.000000001)
#f
> (> 1 2)
#f
> (= 30 30)
#t
> (define (g x) (= x 5))
> (g 17)
#f
> (> 1 2 3 4)
#f
> (< 1 2 3 4)
#t
> 'apple
'apple
> (eq? 'apple 'banana)
#f
> (eq? 'apple 'apple)
#t
> 7
7
> apple
reference to undefined identifier: apple
> (cond)
> (cond [#t 5])
5
> (cond [(= 1 1) 5])
5
> (cond [(+ 1 1) 5])
5
> (cond [0 5])
5
> (cond [#f a])
> (cond [#f (/ 0)])
> (cond [#t (/ 0)])
/: division by zero
> #
syntax error: unexpected end of file inside # syntax
> 3T
reference to undefined identifier: 3t
> #T
#t
> (f (+ 1 2) (* 6 8))
51
> (cons 1 2)
(cons 1 2)
> (+ (cons 1 2) 4)
+: expects type <number> as 1st argument, given: (cons 1 2); other arguments were: 4
> (cons 1 (cons 2 (cons 3 4)))
(cons 1 (cons 2 (cons 3 4)))
> (cons (cons 2 3) 6)
(cons (cons 2 3) 6)
> (cons 1 (+ 1 1))
(cons 1 2)
> (cons 1 (cons 2 (cons 3 (+ 4 5 6 7))))
(cons 1 (cons 2 (cons 3 22)))
> (cddr (cons 1 (cons 2 3)))
3
> (cadr (cons 1 (cons 2 3)))
2
> (car (cdr (cons 1 (cons 2 3))))
2
> (car 1)
car: expects argument of type <pair>; given 1
> (cons 1 (cons 2 '()))
(list 1 2)
> (list 1 2)
(list 1 2)
> (list 1 (+ 2 3))
(list 1 5)
> '()
empty
> (cons '() 1)
(cons empty 1)
> empty
reference to undefined identifier: empty
> '(1 2)
(list 1 2)
> '(a b)
(list 'a 'b)
> '1
1
> '(1 2 (3 4))
(list 1 2 (list 3 4))
> '(1 (a) g)
(list 1 (list 'a) 'g)
> '(1 2 (+ 3 4))
(list 1 2 (list '+ 3 4))
> '+
'+
> '(1 . 2)
(cons 1 2)
> '(1 (a . g) 7)
(list 1 (cons 'a 'g) 7)
> (list 1 (+ 2 3))
(list 1 5)
> (car (list 1))
1
> (cadr (list 1 2))
2
>