16.在Visual Basic中,有如下程序: Private Sub Command1_Click( ) Dim a As Integer,b As Integer,c As Integer Dim d As Integer,z As Integer a=Val(Text1.Text):b=Val(Text2.Text):c=Val(Text3.Text) d=max(a,b) z=max(d,c) Text4.Text=Str(d) Text5.Text=Str(z) End Sub Function max(x As Integer,y As Integer) As Integer If x>y Then max=x Else max=y End Function 運行該程序,在文本框Text1、文本框Text2、文本框Text3中分別輸入2、-5、6后,單擊命令按鈕Command1,文本框Text5中顯示的是( )