Option Explicit Private Hasil As Double Private Const opNol = 0 Private Const opTambah = 1 Private Const opKurang = 2 Private Const opKali = 3 Private Const opBagi = 4 Private Operator As Integer Private NilaiBaru As Boolean ' untuk menghapus karakter terakhir Private Sub Hapus() Dim txt As String Dim min_len As Integer txt = txtDisplay.Text If Left$(txt, 1) = "-" Then min_len = 2 Else min_len = 1 End If If Len(txt) > min_len Then txtDisplay.Text = Left$(txt, Len(txt) - 1) Else txtDisplay.Text = "0" End If End Sub ' hapus angka, hasil terakhir dan operator Private Sub cmdClear_Click() cmdClearEntry_Click Hasil = 0 Operator = opNol End Sub ' hapus angka Private Sub cmdClearEntry_Click() txtDisplay.Text = "" End Sub ' menambahkan koma (desimal) Private Sub cmdKoma_Click() If InStr(txtDisplay.Text, ".") Then Beep Else If NilaiBaru Then txtDisplay.Text = "." " NilaiBaru = False Else txtDisplay.Text = txtDisplay.Text & "." End If End If End Sub ' Menghitung Private Sub cmdSamaDengan_Click() Dim HasilBaru As Double If txtDisplay.Text = "" Then HasilBaru = 0 Else HasilBaru = CDbl(txtDisplay.Text) End If Select Case Operator Case opNol Hasil = HasilBaru Case opTambah Hasil = Hasil + HasilBaru Case opKurang Hasil = Hasil - HasilBaru Case opKali Hasil = Hasil * HasilBaru Case opBagi 'Tidak bisa dibagi nol If HasilBaru = 0 Then MsgBox "Tidak bisa dibagi 0", vbOKOnly + vbCritical, "Kalku ERROR" Call cmdClear_Click Else Hasil = Hasil / HasilBaru End If End Select Operator = opNol NilaiBaru = True txtDisplay.Text = Format$(Hasil) End Sub ' menuliskan angka Private Sub cmdAngka_Click(Index As Integer) If NilaiBaru Then txtDisplay.Text = Format$(Index) NilaiBaru = False Else txtDisplay.Text = _ txtDisplay.Text & Format$(Index) End If End Sub ' tombol tambah/kurang/bagi/kali Private Sub cmdOperator_Click(Index As Integer) cmdSamaDengan_Click Operator = Index NilaiBaru = True End Sub ' merubah tanda +/- Private Sub cmdPlusMinus_Click() If NilaiBaru Then txtDisplay.Text = "-" ElseIf Left$(txtDisplay.Text, 1) = "-" Then txtDisplay.Text = Right$(txtDisplay.Text, 2) Else  Artikel Populer IlmuKomputer.Com Copyright © 2005 IlmuKomputer.Com txtDisplay.Text = "-" & txtDisplay.Text End If End Sub ' filter untuk angka saja yg dapat diketikkan Private Sub Form_KeyPress(KeyAscii As Integer) txtDisplay_KeyPress KeyAscii End Sub Private Sub Form_KeyUp(KeyCode As Integer, Shift As Integer) txtDisplay_KeyUp KeyCode, Shift End Sub ' supaya kursor tetap di kanan Private Sub txtDisplay_Change() txtDisplay.SelStart = Len(txtDisplay.Text) End Sub Private Sub txtDisplay_GotFocus() txtDisplay_Change End Sub ' untuk mengetikkan angka di keyboard Private Sub txtDisplay_KeyPress(KeyAscii As Integer) Dim ch As String ch = Chr$(KeyAscii) Select Case ch Case "0" cmdAngka_Click 0 Case "1" cmdAngka_Click 1 Case "2" cmdAngka_Click 2 Case "3" cmdAngka_Click 3 Case "4" cmdAngka_Click 4 Case "5" cmdAngka_Click 5 Case "6" cmdAngka_Click 6 Case "7" cmdAngka_Click 7 Case "8" cmdAngka_Click 8 Case "9" cmdAngka_Click 9 Case "*", "x", "X" cmdOperator_Click opKali Case "+" " cmdOperator_Click opTambah Case vbCrLf, vbCr, "=" " cmdSamaDengan_Click Case "-" " cmdOperator_Click opKurang Case "." " cmdKoma_Click Case "/" " cmdOperator_Click opBagi Case "C", "c" cmdClearEntry_Click End Select KeyAscii = 0 End Sub ' untuk ketikan angka di numpad Private Sub txtDisplay_KeyUp(KeyCode As Integer, Shift As Integer) Select Case KeyCode Case vbKeyNumpad0 cmdAngka_Click 0 Case vbKeyNumpad1 cmdAngka_Click 1 Case vbKeyNumpad2 cmdAngka_Click 2 Case vbKeyNumpad3 cmdAngka_Click 3 Case vbKeyNumpad4 cmdAngka_Click 4 Case vbKeyNumpad5 cmdAngka_Click 5 Case vbKeyNumpad6 cmdAngka_Click 6 Case vbKeyNumpad7 cmdAngka_Click 7 Case vbKeyNumpad8 cmdAngka_Click 8 Case vbKeyNumpad9 cmdAngka_Click 9 Case vbKeyMultiply cmdOperator_Click opKali Case vbKeyAdd cmdOperator_Click opTambah Case vbKeySeparator cmdSamaDengan_Click Case vbKeySubtract cmdOperator_Click opKurang Case vbKeyDivide cmdOperator_Click opBagi Case vbKeyDecimal cmdKoma_Click Case vbKeyBack, vbKeyDelete Hapus End Select KeyCode = 0 End Sub Private Sub Text1_Change() End Sub