Racket/Erastothenes - Versionshistorik

Anders den 5 april 2026 kl. 14.17

2026-04-05T14:17:31Z

@@ Rad 7: / Rad 7: @@
 ;;;;;
 (define (primes-between start stop)
-   (cond
+   (if (> start stop)
-    [(> start stop) '()]
+      '() ;Returnerar tomt om start > stop
-    [else
+      (let ([is-prime? (make-sieve stop)])
-     ; Skapa en bool-vektor för intervallet [0..stop]
+        (for/list ([n (in-range (max start 2) (add1 stop))]
-     (define sieve (make-vector (+ stop 1) #t))
+                   #:when (vector-ref is-prime? n))
+          n))))
-     ; 0 och 1 är inte primtal
-     (vector-set! sieve 0 #f)
-     (vector-set! sieve 1 #f)
+;; Testkörning
+(primes-between 10 50)
 </pre>

Anders: Skapade sidan med '

 #lang racket  ;;;;; ;; Erastothenes såll implementerad i Racket ;; Täpp-Anders Sikvall 2026-04-03 anders@sikvall.se ;;;;;  (define (primes-between start stop)   (cond     [(> start stop) '()]     [else      ; Skapa en bool-vektor för intervallet [0..stop]      (define sieve (make-vector (+ stop 1) #t))            ; 0 och 1 är inte primtal      (vector-set! sieve 0 #f)      (vector-set! sieve 1 #f)            ; Såll: markera multiplar      ; Går från 2 till (...'

2026-04-05T12:57:37Z

Skapade sidan med '<pre> #lang racket ;;;;; ;; Erastothenes såll implementerad i Racket ;; Täpp-Anders Sikvall 2026-04-03 anders@sikvall.se ;;;;; (define (primes-between start stop) (cond [(> start stop) '()] [else ; Skapa en bool-vektor för intervallet [0..stop] (define sieve (make-vector (+ stop 1) #t)) ; 0 och 1 är inte primtal (vector-set! sieve 0 #f) (vector-set! sieve 1 #f) ; Såll: markera multiplar ; Går från 2 till (...'

← Äldre version		Versionen från 5 april 2026 kl. 12.57
Rad 1:		Rad 1:
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You are unengaged to borrow plus meet a person's salary shortage.~~ [~~http://www.binaryoptions~~-~~world.us interactive broker~~] ~~Being able to show income will go on account of empire's the internets lenders and shop card bills to a minimum .<br>http~~:~~//chms~~-~~scout.org/social/link/96008<br>http~~:~~//story.smartchoicesites.com/groups/buying~~-~~a-california-home-finance-loan/~~<~~br>http:~~/~~/amazonface.com/index.php?do=/blog/110804/entry-level-jobs-in-consumer-banking-and-funding/<br>http://asociacionnatural.com/content/bad-credit-score-payday-loans-united-kingdom-certain-cash-advance<br~~>~~http://mdbegp.org/node/26736~~		<pre>
			#lang racket

			;;;;;
			;; Erastothenes såll implementerad i Racket
			;; Täpp-Anders Sikvall 2026-04-03 anders@sikvall.se
			;;;;;

			(define (primes-between start stop)
			(cond
			[(> start stop) '()]
			[else
			; Skapa en bool-vektor för intervallet [0..stop]
			(define sieve (make-vector (+ stop 1) #t))

			; 0 och 1 är inte primtal
			(vector-set! sieve 0 #f)
			(vector-set! sieve 1 #f)

			; Såll: markera multiplar
			; Går från 2 till (roten ur stop) +1
			; inre vektorn går från i^2 till stop med steglängden i
			; och markerar multiplarna av i genom hela vektorfältet
			(for ([i (in-range 2 (add1 (integer-sqrt stop)))])
			(when (vector-ref sieve i)
			(for ([j (in-range (* i i) (add1 stop) i)])
			(vector-set! sieve j #f))))

			; Samla ihop primtal i intervallet [start, stop]
			(for/list ([i (in-range (max start 2) (add1 stop))]
			#:when (vector-ref sieve i))
			i)]))

			; Exempel på användning:
			(primes-between 100000 200000) ; funkar snabbt även för stora tal
			</pre>

113.212.70.240: Skapade sidan med 'Almost any one requesting for instant loans will be accepted, because these kinds of lending products have effortless lending requirements. [http://www.binaryoptions-world.us ...'

2013-08-25T00:00:53Z

Skapade sidan med 'Almost any one requesting for instant loans will be accepted, because these kinds of lending products have effortless lending requirements. [http://www.binaryoptions-world.us ...'

Ny sida

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