;; The first three lines of this file were inserted by DrRacket. 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 week1_f) (read-case-sensitive #t) (teachpacks ((lib "image.ss" "teachpack" "2htdp"))) (htdp-settings #(#t constructor repeating-decimal #f #t none #f ((lib "image.ss" "teachpack" "2htdp"))))) ; image-size : image -> number ; returns size of image (define (image-size a) (* (image-width a) (image-height a))) (image-size (rectangle 4 4 'outline 'black)) "should be" 16 (image-size (rectangle 10 4 'outline 'black)) "should be" 40 ; bigger-image : image image -> boolean ; returns true if first image has more pixels than second (define (bigger-image a b) (> (image-size a) (image-size b))) (bigger-image (circle 25 'solid 'blue) (rectangle 4 4 'outline 'black)) "should be" true (bigger-image (rectangle 4 4 'outline 'black) (rectangle 25 25 'solid 'blue)) "should be" false