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Attribute VB_Name = "Module1"
Option Explicit
Global Const pi As Double = 3.14159265358979
Sub total(a, c, b)
Select Case b
Case 0
a = a + c
Case 1
a = a - c
Case 2
a = a * c
Case 3
If c = 0 Then MsgBox "0不能做除數", vbCritical: Exit Sub
a = a / c
End Select
End Sub
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