參數對於結構方案

Question

我有這樣的結構適合人羣：

(define-struct person 
    ( 
    first ; a string: first name 
    last  ; a string: last name 
    sex  ; a symbol: 'male, 'female 
    eyes  ; a symbol: 'blue, 'brown', 'green 
    hair  ; a symbol: 'blonde, 'brown, 'black, 'red 
    mother ; a person: empty if not known 
    father ; a person: empty if not known 
    born  ; a number: year of birth 
    ) 
) 

，然後我讓人們：

(define P-00000 (make-person "Alexandra" "Harper" 'female 'blue 'red empty empty 1897)) 
(define P-10000 (make-person "Joshua" "Sherman" 'male 'green 'blonde empty empty 1881)) 
; ... etc 

如何我現在可以訪問特定段的結構。舉個例子，我想顯示P-00000的姓氏，我該怎麼做？

感謝

Answer 1

(structname-fieldname struct) 

因此，對於你的例子：

(person-last P-00000)