حل واجب الة حاسبة

Public Class Form1
Dim a, b, c As String
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
b = TextBox1.Text
If c = "+" Then
TextBox1.Text = (Val(a) + Val(b)).ToString
ElseIf c = "-" Then
TextBox1.Text = (Val(a) - Val(b)).ToString
ElseIf c = "*" Then
TextBox1.Text = (Val(a) * Val(b)).ToString
ElseIf c = "/" Then
TextBox1.Text = (Val(a) / Val(b)).ToString
ElseIf c = "\" Then
TextBox1.Text = (Val(a) \ Val(b)).ToString
ElseIf c = "mod" Then
TextBox1.Text = (Val(a) Mod Val(b)).ToString
End If
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
a = TextBox1.Text
c = "+"
Label2.Text = "+"
TextBox1.Text = ""
TextBox1.Focus()
End Sub
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
a = TextBox1.Text
c = "-"
Label2.Text = "-"
TextBox1.Text = ""
TextBox1.Focus()
End Sub
Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
a = TextBox1.Text
c = "*"
Label2.Text = "*"
TextBox1.Text = ""
TextBox1.Focus()
End Sub
Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
a = TextBox1.Text
c = "mod"
Label2.Text = "mod"
TextBox1.Text = ""
TextBox1.Focus()
End Sub
Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
TextBox1.Text = TextBox1.Text + "-"
End Sub
Private Sub Button17_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button17.Click
a = TextBox1.Text
c = "/"
Label2.Text = "/"
TextBox1.Text = ""
TextBox1.Focus()
End Sub
Private Sub Button19_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button19.Click
a = TextBox1.Text
c = "\"
Label2.Text = "\"
TextBox1.Text = ""
TextBox1.Focus()
End Sub
Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click
TextBox1.Text = TextBox1.Text + "."
End Sub
Private Sub Button8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button8.Click
TextBox1.Text = TextBox1.Text + "1"
End Sub
Private Sub Button9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button9.Click
TextBox1.Text = TextBox1.Text + "2"
End Sub
Private Sub Button10_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button10.Click
TextBox1.Text = TextBox1.Text + "3"
End Sub
Private Sub Button11_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button11.Click
TextBox1.Text = TextBox1.Text + "4"
End Sub
Private Sub Button12_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button12.Click
TextBox1.Text = TextBox1.Text + "5"
End Sub
Private Sub Button13_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button13.Click
TextBox1.Text = TextBox1.Text + "6"
End Sub
Private Sub Button14_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button14.Click
TextBox1.Text = TextBox1.Text + "7"
End Sub
Private Sub Button15_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button15.Click
TextBox1.Text = TextBox1.Text + "8"
End Sub
Private Sub Button16_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button16.Click
TextBox1.Text = TextBox1.Text + "9"
End Sub
Private Sub Button18_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button18.Click
TextBox1.Text = TextBox1.Text + "0"
End Sub
Private Sub Button20_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button20.Click
TextBox1.Clear()
TextBox1.Focus()
End Sub
Private Sub Button21_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button21.Click
Me.Close()
End Sub
End Class

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