北京振则通声波治疗仪:编VB计算器那个小数点怎么设置？我刚学啊！

代码怎么写？Dim X

Dim a

Dim e
Dim i As Double
Private Sub Command1_Click()
i = 1
Text1.Text = Val(Text1.Text) * 10 + i

End Sub

Private Sub Command10_Click()
a = Text1.Text
Text1.Text = " "
X = 1
End Sub

Private Sub Command11_Click()
a = Text1.Text
Text1.Text = " "
X = 2
End Sub

Private Sub Command12_Click()
a = Text1.Text
Text1.Text = " "
X = 3
End Sub

Private Sub Command13_Click()
a = Text1.Text
Text1.Text = ""
X = 4
End Sub

Private Sub Command14_Click()
i = 0
Text1.Text = Val(Text1.Text) * 10 + i
End Sub

Private Sub Command15_Click()
Text1.Text = Val(Text1.Text) * 10 + i
End Sub

Private Sub Command17_Click()
e = Text1.Text
Text1.Text = Sqr(e)
End Sub

Private Sub Command18_Click()
e = Text1.Text
Text1.Text = e * e
End Sub

Private Sub Command19_Click()
Text1.Text = "0"
End Sub

Private Sub Command2_Click()
i = 2
Text1.Text = Val(Text1.Text) * 10 + i
End Sub

Private Sub Command20_Click()
If X = 1 Then
Text1.Text = Val(a) + Val(Text1.Text)
ElseIf X = 2 Then
Text1.Text = Val(a) - Val(Text1.Text)
ElseIf X = 3 Then
Text1.Text = Val(a) * Val(Text1.Text)
ElseIf X = 4 Then
Text1.Text = Val(a) / Val(Text1.Text)
End If
End Sub

Private Sub Command21_Click()
Text1.Text = "0 "
End Sub

Private Sub Command3_Click()
i = 3
Text1.Text = Val(Text1.Text) * 10 + i
End Sub

Private Sub Command4_Click()
i = 4
Text1.Text = Val(Text1.Text) * 10 + i
End Sub

Private Sub Command5_Click()
i = 5
Text1.Text = Val(Text1.Text) * 10 + i
End Sub

Private Sub Command6_Click()
i = 6
Text1.Text = Val(Text1.Text) * 10 + i
End Sub

Private Sub Command7_Click()
i = 7
Text1.Text = Val(Text1.Text) * 10 + i
End Sub

Private Sub Command8_Click()
i = 8
Text1.Text = Val(Text1.Text) * 10 + i
End Sub

Private Sub Command9_Click()
i = 9
Text1.Text = Val(Text1.Text) * 10 + i
End Sub