> 2
2
> 2/3
2/3
> "abc"
"abc"
> \#a
[image] [image] #a: undefined;
 cannot reference an identifier before its definition
> #\a
#\a
> +
#<procedure:+>
> a
[image] [image] a: undefined;
 cannot reference an identifier before its definition
> (define a 5)
> a
5
> (1 2 3)
[image] [image] application: not a procedure;
 expected a procedure that can be applied to arguments
  given: 1
> (+ 2 3)
5
> 2 + 3
2
#<procedure:+>
3
> (+)
0
> (-)
[image] [image] -: arity mismatch;
 the expected number of arguments does not match the given number
  expected: at least 1
  given: 0
> (*)
1
> (+ 1 2 4 5 2 3 2 6)
25
> (/ 5 0)
[image] [image] /: division by zero
> (+12)
[image] [image] application: not a procedure;
 expected a procedure that can be applied to arguments
  given: 12
> (*34)
[image] [image] *34: undefined;
 cannot reference an identifier before its definition
> a
5
> (define b (+ a 2))
> b
7
> (define c (+ b c))
[image] [image] c: undefined;
 cannot reference an identifier before its definition
> (define a (+ a 5))
> a
10
> (define + 10)
[image] [image] ../../usr/share/racket/pkgs/drracket/drracket/private/rep.rkt:1207:22: define-values: assignment disallowed;
 cannot re-define a constant
  constant: +
  in module:top-level
> (define + 10)
[image] [image] ../../usr/share/racket/pkgs/drracket/drracket/private/rep.rkt:1207:22: define-values: assignment disallowed;
 cannot re-define a constant
  constant: +
  in module:top-level
> +
#<procedure:+>
> (define + 10)
> +
10
> (+ 2 3)
. . application: not a procedure;
 expected a procedure that can be applied to arguments
  given: 10
> (define define 32)
> define
32
> (define 2 3)
. . application: not a procedure;
 expected a procedure that can be applied to arguments
  given: 32
> (quote 2)
2
> 2
2
> (quote +)
+
> +
#<procedure:+>
> (quote (+ 2 3))
(+ 2 3)
> (define store+ +)
> store+
#<procedure:+>
> (define + *)
> (+ 3 5)
15
> (store+ 3 5)
8
> (define + store+)
> (+ 3 5)
8
> #\'
#\'
> ''
')))
. read-syntax: unexpected `)`
> (h)
. . /: division by zero
> (square)
. . square: arity mismatch;
 the expected number of arguments does not match the given number
  expected: 1
  given: 0
> (square 1 2)
. . square: arity mismatch;
 the expected number of arguments does not match the given number
  expected: 1
  given: 2
> pi
. . pi: undefined;
 cannot reference an identifier before its definition
> (quote square)
square