How to meet the requirement of button CE & BackSpace in a calculator

How to meet the requirement of button CE & BackSpace in a calculator?

Thank you!

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dc197Connect With a Mentor Commented:
Backspace could trim the text to the left n-1 characters:

Sub Backspace_Click()
   TextInput.Text = Left(Len(TextInput.Text) -1 )
End Sub

CE could clear the text box and wipe all variables:
Sub CE_Click()
   TextInput.Text = ""
   iBuffer = 0
   iCommand = 0 ' etc
End Sub

but I really need more information, sample code, context, etc.
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