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#1
October 19th, 2013, 03:44 AM
 jaym1125
Registered User

Join Date: Oct 2013
Posts: 2
Time spent in forums: 1 h 6 m 18 sec
Reputation Power: 0
New User In Need Of Some Help on VS 2012

Okay, so I'm taking this class that works with the program and one of my assignments is absolutely killing me right now. I'm new so odds are I'll probably be coming here to ask for help a lot, just saying. But anyways, back to my problem.

For one of my assignments, I have to write a program that charges \$0.05 for the first 100 copies and \$0.03 per each additional copy. So here's the code I came up with so far:

Code:
```Public Class Form1

Private Sub btnCompute_Click(sender As Object, e As EventArgs) Handles btnCompute.Click
Dim num, cost As Double
num = CDbl(txtNumCopy.Text)
If num = 100 Then
cost = 0.05 * num '5 cents for first 100 copies
Else
If num > 100 Then
cost = 0.03 * num '3 cents for additional copies
End If
End If
txtCost.Text = cost.ToString("C")
End Sub
End Class```

Now I've bolded where I think I'm having the biggest problem so I have no idea how to come up with the right equation to come up with the solution that gives me 125 copies for \$5.75. Anyone care to tell me where my code is faulty? Thanks for any help!!

#2
October 19th, 2013, 12:44 PM
 couttsj
Contributing User

Join Date: Aug 2011
Posts: 269
Time spent in forums: 4 Days 58 m
Reputation Power: 44
What you have to understand is that VB Controls use Variants which are coerced into whatever is required for the calculation. So there is a lot of redundancy in your code. As well, you should check that it is actually numeric before attempting a calculation.

J.A. Coutts
Code:
```Private Sub cmdCalc_Click()
Dim Cost As Currency
If IsNumeric(txtNumCopy.Text) Then
If Val(txtNumCopy) <= 100 Then
Cost = txtNumCopy.Text * 0.05
Else
Cost = 100 * 0.05 + (txtNumCopy.Text - 100) * 0.03
End If
Else
MsgBox "Number of copies is not a numeric value!", vbExclamation
Exit Sub
End If
txtCost.Text = Format(Cost, "0.00")
End Sub```

Last edited by couttsj : October 19th, 2013 at 01:04 PM.

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