以下程序段的输出结果是() num =0 DO While num<=2 num = num+1 Loop Print num
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以下能够正确计算n!的程序是()
A. Private Sub Command1_Click() n = 5: x = 1 Do x = x * I i = i + 1 Loop While i < n Print x End Sub
B. Private Sub Command1_Click() n = 5: x = 1:i = 1 Do x = x * I i = i + 1 Loop While i < n Print x End Sub
C. Private Sub Command1_Click() n = 5: x = 1:i = 1 Do x = x * I i = i + 1 Loop While i <= n Print x End Sub
D. Private Sub Command1_Click() n = 5: x = 1:i = 1 Do x = x * I i = i + 1 Loop While i > n Print x End Sub
用鼠标拖动滚动条中滚动框并释放,将触发滚动条的()事件.
A. Roll
B. Change
C. DragOver
D. Min
在窗体上画1个命令按钮(名称为Command1)和1个文本框(名称为Text1),然后编写如下事件过程: Private Sub Command1_Click() x=Val(Text1.Text) Select Case x Case 1, 3 y = x * x Case Is >= 10, Is <= -10 y = x Case -10 To 10 y = -x End Select End Sub 程序运行后,在文本框中输入3,然后单击命令按钮,则以下叙述中正确的是()
A. 执行y=x*x
B. 执行y=-x
C. 先执行y=x*x,再执行y=-x
D. 程序出错
若矩阵A可逆,那么A的特征值( )
A. 全都相等;
B. 不全为零;
C. 互不相等;
D. 全不为零.
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