;; Hello world as a variable
(define vhello "Hello world")
;; Hello World as a function
(define fhello (lambda ()
		 "hello world"))

;; hello with name
(define hello
  (lambda (name)
    (string-append "hello " name "!")))

;; sum of three numbers
(define sum3
  (lambda (a b c)
    (+ a b c)))

(define add1
  (lambda (a)
    (+ a 1)))

(define sub1
  (lambda (b)
    (- b 1)))
(display(string-append "sub1 to 2 is " (number->string(sub1 2)) "\n"))


;; display message on screen
(display "Hello World!")