Private Sub Command1_Click()

Dim x1 As Single, x2 As Single, x3 As Single

Dim a As Single

x1 = Val(Text1.Text)

x2 = Val(Text2.Text)

x3 = Val(Text3.Text)

Call max(x1, x2, x3, a)

Label4.Caption = "最大值是" & a

End Sub

Private Sub max(x As Single, y As Single, z As Single, maxx As Single)

maxx = x

If y > maxx Then

maxx = y

If z > maxx Then

maxx = zEnd Sub