填空题：设有如下程序Private Sub Form Click()Dim a As Integer,b As Integera

设有如下程序
Private Sub Form Click()
Dim a As Integer,b As Integer
a=20：b=50
P1 a.b
p2 a.b
p3 a，b
Print“a=”；a，“b=”；b
End Sub
Sub pl(x As Integer，ByVal Y As Integer)
x=x+10
y=y+20
End Sub
Sub p2(ByVal x As Integer,Y As Integer)
x=x+10
y=y+20
End Sub
Sub p3(ByVal x As Integer，ByVal Y As Integer)
x=x+lO
y=y+20
End Sub
该程序运行后，单击窗体，则在窗体上显示的内容是：a=【1】和b=【2】。