3、An example of a library function that does not have an associated system call is the strlen function declared in string.h.
4、接下來的函數確定每個賦值項的lvalue的長度,這通過將strlen函數映*到已過濾的函數的副本上來實現。
2、沒有相關係統調用的庫函數的一個示例是string . h中聲明的strlen函數。
1、You may receive error messages about strcasecmp as well as about strlen being undeclared.