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Feb 20th, 2018
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  1. (define (zahlenblock block blocklaenge)
  2. (cond ((equal? 0 blocklaenge) 0)
  3. (else (+ (hunderter (char->integer (first block)) blocklaenge) (zahlenblock (rest block) (- blocklaenge 1))))))
  4.  
  5.  
  6. (define (hunderter zahl stelle)
  7. (cond ((= 1 stelle) zahl)
  8. (else (* (hunderter zahl (- stelle 1)) 100))))
  9.  
  10. (define (verschluesseln text schluessel blocklaenge)
  11. (cond ((equal? 0 blocklaenge) schluessel)
  12. (else (+ (hunderter (char->integer (first (string->list text))) blocklaenge) (verschluesseln (list->string (rest (string->list text))) schluessel (- blocklaenge 1))))))
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