element-type in array..

HI
If I try to make a resizable string with make-array, but error raises with vector-push..:

(defparameter str (make-array 10 :fill-pointer 0 :adjustable t :element-type 'character))
>STR
(vector-push 'a' str)   ;;error raise:

value STR is not of the expected type (AND
                                       ARRAY
                                       (SATISFIES
                                        ARRAY-HAS-FILL-POINTER-P)).
   [Condition of type TYPE-ERROR]

....?it works without specify :element-type.....but why it's atype error?? 'a' is a char...
thanks in advance!!!

Because 'a' isn't a character. This works:

(vector-push #\a str)

(vector-push 'a' str) is the same as (vector-push 'a 'str) is the same as (vector-push (quote a) (quote str)) -- you're trying to push the symbol A onto the symbol STR.

You probably want VECTOR-PUSH-EXTEND, too.

opss'!!!
perfect thanks!