执行下面程序,单击命令按钮Cmd1后输出的fun函数值是___(4)___,a的值是___(5)___ ,b的值是___(6)___。Option ExplicitPrivate Sub Cmd1_Click() Dim a As Integer,b As Integer a=8 b=12 Print fun(a,b);a;bEnd SubPrivate Function fun(ByVal a As Integer,b As Integer)As Integer a=a Mod 5 b=b\5 fun=a+bEnd Function