[填空题] 设有如下程序:
Prirate 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 p1(x As Integeh By Val 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+10
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= (11) 和b= (12) 。