Question

VB题：执行下面程序，单击命令按钮后5秒,输出的结果为

执行下面程序，单击命令按钮后5秒,输出的结果为:
Dim s1 As String, s2 As String, s3 AsString, s4 As String
PrivateSub Form_Load()
s1 = "A"
s2 = "B"
s3 = "C"
Timer1.Interval = 1000
End Sub
Private Sub Command1_Click()
Timer1.Enabled = True
End Sub
Private Sub Timer1_Timer()
s4 = s3
s3 = s2
s2 = s1
s1 = s4
Print s1;
End Sub
求解答案和过程

Answer 1

启动初始化，给变量赋值，时间定在1秒，点击命令按钮1秒后，执行运算，S1=S4=S3=“C”，输出S1=“C”