Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim b, a, x, y, a1, a2, j, a11, a22, r As Integer
        Dim op, ans As String
        Dim b1, b2, b3, b4 As String

        FileOpen(1, "C:\title.TXT", OpenMode.Input)
        Input(1, b1) : Input(1, b2) : Input(1, b3) : Input(1, b4)

        TextBox1.Text = b1 : TextBox2.Text = b2 : TextBox3.Text = b3 : TextBox4.Text = b4

        FileClose()

        FileOpen(1, "C:\940308.sm", OpenMode.Input)
        j = 0
        Do While Not EOF(1)
            Input(1, b) : Input(1, a)
            Input(1, op)
            Input(1, y) : Input(1, x)
            Select Case op
                Case "+"
                    a1 = b * x + a * y
                    a2 = a * x
                Case "-"
                    a1 = b * x - a * y
                    a2 = a * x
                Case "*"
                    a1 = b * y
                    a2 = a * x
                Case "/"
                    a1 = b * x
                    a2 = a * y
            End Select
            r = a1 Mod a2
            If r = 0 Then
                ans = a1 / a2
            Else
                a11 = a1 : a22 = a2
                Do Until r = 0
                    a11 = a22
                    a22 = r
                    r = a11 Mod a22
                Loop
                ans = (a1 / a22) & "/" & (a2 / a22)
            End If
            With DataGridView1
                .Rows.Add(1)
                .Item(0, j).Value = b & "/" & a
                .Item(1, j).Value = op
                .Item(2, j).Value = y & "/" & x
                .Item(3, j).Value = ans
                .Height = j * 38
            End With
            j = j + 1
            Me.Height = 150 + j * 35

        Loop
        FileClose()
    End Sub
End Class