如何找到數字中最大的數字？球拍

Question

(define hmaxDigit 
    (lambda (n b) 
    (cond 
     ((< n 10) n) 
     ((> n (* 10 b)) (hmaxDigit n (* b 10))) 
     ((< 10 (remainder b)) 
     ((> (quotient n b) (remainder n b)) (quotient n b)) 
     ((< (quotient n b) (remainder n b)) (remainder n b))))) 

這是我的，但它只適用於2位數字。

Answer 1

If n<10 then n is the_maximum_digit 
else the_maximum_digit is the maximum of 
           the first_digit and 
           the maximum of the remaining digits. 

(define (maximum-digit n) 
    (cond 
    [(< n 10) n] 
    [else  (max (first-digit n) (maximum-digit (remaining-digits n)))])) 

詳細信息，如first-digit和remaining-digits需要填寫。