Applescript错误“无法结束”

Question

I am trying my hand at Applescript and can't see anything wrong with this. The Error I get is

error "Can't get end of {button returned:\\"OK\\", text returned:\\"3\\"}." number -1728 from last insertion point of {button returned:"OK", text returned:"3"}

This is my code:

beep
set counter to 0
set tempX to 0
set temp to 0
set counting to 0
set stored to {0}
set input to "How many grades do you wish to enter?" as string
set str to display dialog input buttons {"NEXT"} default button "NEXT" default answer ""
repeat text returned of str times
    counting = counting + 1
    set grades to display dialog "GRADES:  " default answer ""
    set stored to grades
end repeat
set rep to the length of stored
repeat rep times
    counter = counter + 1
    set tempX to the ((end of stored) - counter) as number
    set temp to temp + tempX
end repeat
set ln to the length of grades
set average to temp / ln
if text returned of str is 1 then
    say "The Average of your grade is " & average using "Zarvox"
else
    say "The Average of your grades is " & average using "Zarvox"
end if
get "AVERAGE:  " & average

Answer 1

So, before I begin: I'd strongly recommend that you teach yourself how to use the Javascript interface to Apple Events, rather than the Applescript language itself. Applescript is a really weird language, and its quirks are largely unique; learning it is going to be frustrating, and won't help you learn other languages.

That being said, let's dive into your code:

set stored to {0}

This would start you out with one grade that's always present and set to zero. You probably want to just initialize this to an empty list:

set stored to {}

---

Next:

set grades to display dialog "GRADES:  " default answer ""

This sets grades to a result object , not just the answer. What you probably want here is actually the text returned of the result:

set grades to text returned of (display dialog "GRADES:  " default answer "")

(This is what's creating the really weird-looking object in your error message.)

---

Next, you overwrite stored with this result object:

set stored to grades

What you probably want here is to insert this element into the list. Because Applescript is a strange and obnoxious language, this is somewhat more cumbersome than you're thinking:

set stored to stored & {grades}

---

Finally, there's some logical issues with your averaging; you're adding the end of stored (that is, the last grade input) to the temp variable each time. A much simpler approach would be:

set temp to 0
repeat with n in stored
    set temp to temp + n
end repeat
set average to sum / (count of stored)

---

With these changes all made, your script should work correctly.