;; The first three lines of this file were inserted by DrScheme. They record metadata
;; about the language level of this file in a form that our tools can easily process.
#reader(lib "htdp-beginner-reader.ss" "lang")((modname broken) (read-case-sensitive #t) (teachpacks ()) (htdp-settings #(#t constructor repeating-decimal #f #t none #f ())))
; This program is purposefully broken.
; You need to fix it. 
; if an operation is impossible and cannot be fixed by fixing the syntax, 
; just comment it out by putting ; in the beginning of the line
(define a 2)
(define b 3)
(a - b) ; subtract a from b
(plus a b) ; add a and b
* a b ; multiply a by b
(define a 5) ; give another value to a
(/ a (- b b)) ; find the result of this expression
(define (double x) (+ x x )) ; define a function to double its argument
(double a a) ; double a