Now you'll create a more generalized concatenationfunction using the two functions Lisp is famous for: car and CDR.
现在您将使用两个著名的Lisp car和cdr函数创建更通用化的concatenation函数。
2
This warning indicates that a call to a string concatenationfunction is probably passing an incorrect value for the number of characters to concatenate.
此警告意味着在调用字符串串联函数时,所传递的表示串联字符数的值可能不正确。
3
Remember that the concatenation using concat2 requires two strings, so a number will cause this function to break within the recursion.