在窗体上画一个命令按钮(名称为Command1),并编写如下代码:Function Fun1(ByVal a As Integer, b As Integer)As Integer Dim t As Integer t=a-b b=t+a Fun1=t+bEnd FunctionPrivate Sub Command1_Click() Dim x As Integer x=10 Print Fun1(Fun1(x,(Fun1(x, x-1))), x-1)End Sub程序运行后,单击命令按钮,输出结果是( )。