asp overflow error? HARD! HELP!

[dethfire]

I am trying to make a GPA calculator, this page is the last step once the person has fillout out a form telling the third page the grades and how many classes he/she has.

but... here is an error I have no clue how to fix:

------------------------------------------------
Microsoft VBScript runtime error '800a0006'

Overflow

/link/third.asp, line 78
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here is my code for the third page, where I announce gpa's value is where the error accurs (line 78)

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<%@ Language="VBscript" %>

<%
dim noclasses, hoursnew, arrgrade(8)
dim arrhour(8), counter, counter2, total, grandtotal

counter = 1
counter2 = 1
noclasses = request.form("classesnum")
hoursnew = request.form("hoursnew")
arrhour(hoursnew)= array(request.form("1"), request.form("2"), request.form("3"), request.form("4"), request.form("5"), request.form("6"), request.form("7"), request.form("8"))
arrgrade(hoursnew)= array(1, 2, 3, 4, 5, 6, 7, 8)

for score = 1 to hoursnew

if arrhour(counter) = "A+" then
arrgrade(counter2)= 4.33

elseif arrhour(counter)= "A" then
arrgrade(counter2)= 4.0

elseif arrhour(counter)= "A-" then
arrgrade(counter2)= 3.67

elseif arrhour(counter)= "B+" then
arrgrade(counter2)= 3.33

elseif arrhour(counter)= "B" then
arrgrade(counter2)= 3.00

elseif arrhour(counter)= "B-" then
arrgrade(counter2)= 2.67

elseif arrhour(counter)= "C+" then
arrgrade(counter2)= 2.33

elseif arrhour(counter)= "C" then
arrgrade(counter2)= 2.00

elseif arrhour(counter)= "C-" then
arrgrade(counter2)= 1.67

elseif arrhour(counter)= "D+" then
arrgrade(counter2)= 1.33

elseif arrhour(counter)= "D" then
arrgrade(counter2)= 1.00

elseif arrhour(counter)= "D-" then
arrgrade(counter2)= .67

else
arrgrade= 0

end if

counter = counter + 1
counter2 = counter2 + 1

next
%>


<% total= arrgrade(1) + arrgrade(2) + arrgrade(3) + arrgrade(4) + arrgrade(5) + arrgrade(6) + arrgrade(7) + arrgrade(8)

gpa = total / classesnum

%>

Here is your GPAbr>
<%=gpa%>

[DaveMaxwell]

I believe arrays have to start with 0, not with 1. Your loop should go from 0 to (hournew - 1) instead of 1 to hournew.

And looking at your code quickly, I don't think this is going to provide you with what you want. You've got arrays within arrays, but you're only trying to access the outside array. I don't think you'll get what you want. Here's what I mean.

You've got an array called arrhour. Say hoursnew = 4 and you're form("1") = A+, etc. The way you've got it declared (unless I understand arrays incorrectly), you'll have this in arrhour(- means null):

arrhour(0) = - - - - - - - -
arrhour(1) = - - - - - - - -
arrhour(2) = - - - - - - - -
arrhour(3) = - - - - - - - -
arrhour(4) = A+ A A- B+ B B- C+ C

I think the correct declaration for the array would be(this is based on an example from ASP101:
arrhour array(request.form("1"), request.form("2"), request.form("3"), request.form("4"), request.form("5"), request.form("6"), request.form("7"), request.form("8"))

Here is the link if you want to see what I used as a reference. Good luck!!!