Task

 Describe, and give a pointer to documentation on your languages use of characters beyond those of the ASCII character set in the naming of variables.
 Show how to:
 Set a variable with a name including the 'Δ', (delta character), to 1 
 Increment it
 Print its value.


Related task
 
 Case-sensitivity of identifiers


 
#lang racket
 
;; Racket can use Unicode in identifier names
(define √ sqrt)
(√ 256) ; -> 16
;; and in fact the standard language makes use of some of these
(λ(x) x) ; -> an identity function
 
;; The required binding:
(define Δ 1)
(set! Δ (add1 Δ))
(printf "Δ = ~s\n" Δ) ; prints "Δ = 2"
 
 