Kodlar:
Public Class Form1
Private IslemSecildi As Boolean = False
Private Sayi As Double
Private Islem As String
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click, Button0.Click, Button2.Click, Button3.Click, Button4.Click, Button5.Click, Button6.Click, Button7.Click, Button8.Click, Button9.Click
If Not IslemSecildi Then
txtSayi.Text &= sender.Text
Else
txtSayi.Text = sender.Text
IslemSecildi = False
End If
End Sub
Private Sub btnCarp_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCarp.Click, btnBol.Click, btnCikar.Click, btnTopla.Click
Islem = sender.Text
Try
Sayi = txtSayi.Text
IslemSecildi = True
Catch ex As Exception
MsgBox("Sayı düzgün formatta girilmedi")
Finally
txtSayi.Text = ""
txtSayi.Focus()
End Try
End Sub
Private Sub btnEsit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnEsit.Click
Select Islem
Case "*"
Sayi *= txtSayi.Text
Case "/"
Sayi /= txtSayi.Text
Case "-"
Sayi -= txtSayi.Text
Case "+"
Sayi += txtSayi.Text
End Select
txtSayi.Text = Sayi
End Sub
Private Sub btnTemizle_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnTemizle.Click
Sayi = 0
IslemSecildi = False
txtSayi.Text = ""
txtSayi.Focus()
End Sub
End Class
