Public Function 累加(ByVal 開始值 As Integer, ByVal 結束值 As Integer) As Long
Dim i As Long = 0
Dim Sum As Long = 0
For i = 開始值 To 結束值 Step 1
Sum += i
Next
Return Sum
End Function
Private Sub Btn_Calculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btn_Calculate.Click
Dim 開始值 As Integer = Val(Txt_Start.Text)
Dim 結束值 As Integer = Val(Txt_Stop.Text)