From c5fcf7179a83ef65c86c6a4a390029149e518649 Mon Sep 17 00:00:00 2001 From: Franciszek Malinka Date: Tue, 5 Oct 2021 21:49:54 +0200 Subject: Duzy commit ze smieciami --- semestr-2/racket/lista6/solution.bak | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 semestr-2/racket/lista6/solution.bak (limited to 'semestr-2/racket/lista6/solution.bak') diff --git a/semestr-2/racket/lista6/solution.bak b/semestr-2/racket/lista6/solution.bak new file mode 100644 index 0000000..0805991 --- /dev/null +++ b/semestr-2/racket/lista6/solution.bak @@ -0,0 +1,27 @@ +#lang racket + +(provide (struct-out complex) parse eval) + +(struct complex (re im) #:transparent) + +(define value? + complex?) + +;; Ponizej znajduje sie interpreter zwyklych wyrazen arytmetycznych. +;; Zadanie to zmodyfikowac go tak, by dzialal z liczbami zespolonymi. + +(struct const (val) #:transparent) +(struct binop (op l r) #:transparent) + +(define (op->proc op) + (match op ['+ +] ['- -] ['* *] ['/ /])) + +(define (eval e) + (match e + [(const n) n] + [(binop op l r) ((op->proc op) (eval l) (eval r))])) + +(define (parse q) + (cond [(number? q) (const q)] + [(and (list? q) (eq? (length q) 3) (symbol? (first q))) + (binop (first q) (parse (second q)) (parse (third q)))])) \ No newline at end of file -- cgit v1.2.3