inputBox Excel VBA Integer problems - vba

Question

I am new to VBA and I'm trying to create a macro that from a inputBox accepts a number between 0 and 1000 and converts it to hexadecimal. Well it works, but I am struggling to keep the program accepting that range ( 0 - 1000). This is what happens:
If I input -1 it throws a error;
If I input -1001 it throws a FFFFFFFC17;
If I input any value above 1000 it doesn't throw a MsgBox (I am not familiar with causing error on excel for now).
I've done first like this:
Sub DecToHex()
Dim inputDec As Integer
Dim outputHex As String
inputDec = InputBox("Decimal?")
If inputDec <= 1000 And inputDec >= 0 Then
outputHex = Application.WorksheetFunction.Dec2Hex(inputDec)
MsgBox ("Hex: " + outputHex)
Else
MsgBox ("Error! Please define decimal. It must be larger than zero and less than 1001")
inputDec = InputBox("Decimal?")
outputHex = Application.WorksheetFunction.Dec2Hex(inputDec)
MsgBox ("Hex: " + outputHex)
End If
End Sub
But then I thought well inputBox gives me input as string, so maybe I should accept values as string, so I changed:
Dim inputDec As Integer
'Changed to
Dim inputDec As String
Which still did a poorly control on variables ( ie. it accepts -1200, as also 1200 ). So can you point out what am I doing wrong? Maybe it's the Worksheet Function I'm not reading well. I know it's newbie mistake but it's important for me to understand how to control these input variables from inputBox.

Answer 1

You need to declare the inputDec As Variant
You need to Handle the Cancel Button
You need to put the code in a loop so that when user enters an invalid number, the inputbox can pop up again.
You need to use Application.InputBox with Type:=1 so that only numbers can be accepted.
Try this
Sub DecToHex()
Dim inputDec As Variant
Dim outputHex As String
Do
inputDec = Application.InputBox("Decimal?", Type:=1)
'~~> Handle Cancel
If inputDec = "False" Then Exit Do
If inputDec <= 1000 And inputDec >= 0 Then
outputHex = Application.WorksheetFunction.Dec2Hex(inputDec)
MsgBox ("Hex: " + outputHex)
Exit Do '<~~ Exit the loop
Else
MsgBox ("Error! Please define decimal. It must be larger than zero and less than 1001")
End If
Loop
End Sub