有下面程序代码: Private Sub Command1_Click() Dim sign As Integer sign = 1 a = 1 b = 2 For
有下面程序代码: Private Sub Command1_Click() Dim sign As Integer sign = 1 a = 1 b = 2 For k = 1 To 5 c = a + sign * b a = b b = c Print c; sign = -sign Next k End Sub 程序运行后,单击命令按钮Command1,输出结果是_______________。
A、3 -1 2 -3 -1
B、3 5 8 13 21
C、-1 1 -2 -1 -1
D、3 4 5 6 7