Dim bolDot As Boolean
Dim dblACC1, dblACC2 As Double
Dim dblACC3 As Double = 10
Dim strOp As String
Private Sub add_num(ByVal intNumber As Integer)
If bolDot Then
dblACC1 = dblACC1 + intNumber / dblACC3
dblACC3 *= 10
Else
dblACC1 = dblACC1 * 10 + intNumber
End If
txtResult.text = CStr(dblACC1)
End Sub
Private Sub action(ByVal strCurrentop As String)
Select Case strOp
Case Is = "+"
dblACC2 = dblACC2 + dblACC1
dblACC1 = 0
Case Is = "-"
dblACC2 = dblACC2 - dblACC1
Case Is = "*"
dblACC2 = dblACC2 * dblACC1
dblACC1 = 0
Case Is = "/"
dblACC2 = dblACC2 / dblACC1
dblACC1 = 0
Case Is = "="
Case Else
dblACC2 = dblACC1
dblACC1 = 0
End Select
strOp = strCurrentop
txtResult.Text = dblACC2
bolDot = False
dblACC3 = 10
End Sub
Private Sub btn0_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn0.Click
Call add_num(0)
End Sub
Private Sub btn1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn1.Click
Call add_num(1)
End Sub
Private Sub btn2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn2.Click
Call add_num(2)
End Sub
Private Sub btn3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn3.Click
Call add_num(3)
End Sub
Private Sub btn4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn4.Click
Call add_num(4)
End Sub
Private Sub btn5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn5.Click
Call add_num(5)
End Sub
Private Sub btn6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn6.Click
Call add_num(6)
End Sub
Private Sub btn7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn7.Click
Call add_num(7)
End Sub
Private Sub btn8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn8.Click
Call add_num(9)
End Sub
Private Sub btn9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn9.Click
Call add_num(9)
End Sub
Private Sub btndot_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btndot.Click
bolDot = True
End Sub
Private Sub btnPlus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnPlus.Click
Call action("+")
End Sub
Private Sub btnMinus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnMinus.Click
Call action("-")
End Sub
Private Sub btntimes_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btntimes.Click
Call action("*")
End Sub
Private Sub btndivide_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btndivide.Click
Call action("/")
End Sub
Private Sub btnClear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnClear.Click
dblACC1 = 0
dblACC2 = 0
dblACC3 = 10
bolDot = False
strOp = ""
txtResult.Text = ""
End Sub
Private Sub btnPi_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnPi.Click
dblACC1 = Math.PI
dblACC3 = 10
bolDot = False
txtResult.Text = dblACC1
End Sub
Private Sub btnSQRt_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSQRt.Click
dblACC1 = Math.Exp(Math.Log(dblACC1) / 2)
dblACC3 = 10
bolDot = False
txtResult.Text = dblACC1
End Sub
End Class
