Input Box Error

Hello, I have this minor problem in my Inputbox,

here's my code

Code:

---

Dim price As Double
price = 40

Dim qty As Integer
If chkIcedTea = vbChecked Then
    lstItem.AddItem chkIcedTea.Caption
    qty = InputBox("Enter Quantity:", "Input Quantity")
       
    lstQty.AddItem qty
    Call multiplier(price, qty)
    lstPrice.AddItem sum
 
End If

---

the error is "type mismatch" everytime I click the cancel and when the inputbox in empty. How can I avoid this error?

qty is a numeric variable, InputBox returns a string value. If you try to set a numeric variable to a string that cannot be converted to some numeric value, type mismatch error.

Suggest: qty = Val(InputBox("Enter Quantity:", "Input Quantity"))
That still isn't perfect as it can still generate errors if someone provides an extremely long number. You may want to include error checking. If an error occurs, display a message something like: Invalid value, please try again"

How can I check if the Input contains a letter, that's one of my problem, anyway, thanks for the code it works..

Couple things:

1) If InputBox returns "", then either user hit OK with no input entered or hit the Cancel button
2) IsNumeric() may be helpful
3) Sill nothing but error checking will help if someone adds an extremely long number in the box

Code:

---

Dim strInPut As String
...
    strInput = InputBox("Enter Quantity:", "Input Quantity")
    If strInput <> "" Then
        If IsNumeric(strInput) = False Then
              ' add a msgbox & invalid entry warning
        Else
              On Error Resume Next
              qty = CInt(strInput)
              If Err Then
                  ' add a msgbox & invalid entry warning
              Else
                  On Error GoTo 0 ' turn off error checking
                  ... rest of your code
              End If
        End If
    End If

---

thank you, It works! :)