Project Clean-Up - Errors Occur When Someone Doesn't Pick A Value

Oct 21, 2009

today I finished my VB project which is a program that generates costs of pizza's by what the customer order. The code is all complete just looking for some idea's on to stop bugs and clean up the code. So below is all my code and picture of the form. Errors occur when someone doesn't pick a value, so what i want is there to be default values as 0.

[Code]...

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[code]...

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[code]....

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Private Function ledgerMasterFullName(ByVal i As Integer) As String
Dim fullName As String
Dim vObj As Object

[code]....

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[CODE]...

So if counter finishes, execute the following code

If counter > 4 And km >= 1 And kmcashset = 0 Then 'If there is still kms to calculate 'And kmcashset = 0
kmcashholder = kmcash
km = km / 5

[CODE]...

And if I add counter = 0 and km = 0 at the end of that "If counter > 4 And km >= 1 And kmcashset = 0" Then it doesn't calculate anything correctly. I supply it with 9 for Distance and it returns 4 for excessdistance which is correct but returns 7 for excessdistancecharge when it should be 4! When I supply 23 for Distance it returns 18 for excessdistance and 11 for excess distance charge which is correct. (???)

Excessweightcharge calculates correctly.

I think it may be the way I'm implementing it, through the use of AND or maybe it's because it's in timer tick?

-Minimum charge of $5 which covers 10 kgs for the first 5 kms only
-Each kg over 10 kgs incurs a charge of $0.50
-Distances over 5 kms incur an additional charge of $1 per km up to 10 kms
-For deliveries over 10 kms, the extra distance should be rounded up to the nearest 5 kms and charged at $2 for each extra 5 km block.

EXAMPLE 1:
Packet weighing 9kms travelling 9 kms
Standard charge for first 5 kms ($5.00)
Weight less than 10 kgs so no extra weight charge
Extra distance charge 9 - 5 kms = 4kms x $1 = ($4)
Total delivery charge = $5 plus $4 = $9

[But my program returns 7 for excess distance charge]

EXAMPLE 2:
Packet weighing 33kgs travelling 23 kms
Standard charge for the first 5 kms ($5)
Excess weight 33 - 10 kgs = 23kgs x $0.50 ($11.50)
Extra distance (23 - 5kms = 18kms):
18kms ( 5 to 10 kms at $1/km) = ($5)
13kms (18-5)/5 = 3 (rounded up) x $2.00 = ($6)
$5 + $6 = $11
Total delivery charge = $5 plus $11.50 plus $11 = $27.50

[My program calculates everything correctly]

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[CODE]...

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[code].....

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[Code]....

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[code].....

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Code: 

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[CODE]...

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[code]....

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[code].....

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[Code]...

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[code]....

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[Code].....

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