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- (define (zahlenblock block blocklaenge)
- (cond ((equal? 0 blocklaenge) 0)
- (else (+ (hunderter (char->integer (first block)) blocklaenge) (zahlenblock (rest block) (- blocklaenge 1))))))
- (define (hunderter zahl stelle)
- (cond ((= 1 stelle) zahl)
- (else (* (hunderter zahl (- stelle 1)) 100))))
- (define (verschluesseln text schluessel blocklaenge)
- (cond ((equal? 0 blocklaenge) schluessel)
- (else (+ (hunderter (char->integer (first (string->list text))) blocklaenge) (verschluesseln (list->string (rest (string->list text))) schluessel (- blocklaenge 1))))))
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