VB上机考试 习题以及答案
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VB上机考试
1、利用随机函数产生25个100到999之间的整数，构成5 5的矩阵，输出该矩阵。Dim a(1 To 5, 1 To 5)
Private Sub Form_Click()
Randomize
For i = 1 To 5
For j = 1 To 5
a(i, j) = Int(Rnd * (999 - 100 + 1) + 100)
Print a(i, j);
Next j
Next i
End Sub
2、利用随机函数产生25个10到99之间的整数，求其平均值(要求保留3位小数，第4位四舍五入)。Private Sub Form_Click()
For i = 1 To 25
a = Int(Rnd * (99 - 10 + 1) + 10)
Print a;
s = s + a
Next i
Avg = s / 25
Print Avg
End Sub
3、在窗体上按下鼠标的右键，记录其坐标。
Private Sub Form_Load() Label1.BorderStyle = 1
Label1.Alignment = 2
End Sub
Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
If Button = 2 Then
Label1.Caption = X & "," & Y
End If
End Sub
4、利用随机函数产生25个10到99之间的整数，按从小到大的顺序显示。Dim a(1 To 25)
Private Sub Form_Click()
Cls
For i = 1 To 25
a(i) = Int(Rnd * (99 - 10 + 1) + 10)
Print a(i);
Next i
For i = 1 To 25 - 1
For j = 1 To 25 - i
If a(j) > a(j + 1) Then tmp = a(j): a(j) = a(j + 1): a(j + 1) = tmp Next j
Next i
For i = 1 To 25
Print a(i);
Next i
End Sub
5、利用随机函数产生50个 [1,6] 之间的整数, 分别统计出1的个数，2的个数，3的个数，4的个数，5的个数和6的个数。Dim a(1 To 6)
Private Sub Form_Click()
For i = 1 To 6
a(i) = 0
Next i
For j = 1 To 50
x = Int(Rnd * (6 - 1 + 1) + 1)
a(x) = a(x) + 1
Next j
For i = 1 To 6
Print i & "出现了" & a(i); "次"
Next i
End Sub
6、在文本框中输入一些英语单词，统计空格的个数。
Dim n%, x As String, s% Private Sub Form_Click()
n = Len(Text1.Text)
x = Text1.Text
For i = 1 To n
If Mid(x, i, 1) = " " Then s = s + 1
Next i
Print "共出现了" & s & "个空格"
End Sub
7、编程计算下列公式的值，其中n (<10)为从键盘输入的正整数。
S=1!+3!+5!+……+(2*n-1)!Private Sub Form_Click()
n = Val(InputBox("请输入一个不大于10的整数"))
s = 0
For i = 1 To 2 * n - 1 Step 2
p = 1
For j = 1 To i
p = p * j
Next j
s = s + p
Next i
Print s
End Sub
8、编程计算下列公式的值，其中n (<10)为从键盘输入的正整数。
S=2!+4!+6!+……+(2*n)!Private Sub Form_Click()
n = Val(InputBox("请输入一个不大于10的整数"))
s = 0
For i = 2 To 2 * n Step 2
p = 1
For j = 1 To i
p = p * j
Next j
s = s + p
Next i
Print s
End Sub
9、用For …Next语句编程，双击窗体后，在屏幕上显示如图：
Private Sub Form_Click()
a = 0
For i = 1 To 3
Print Tab(8 - 2 * i - 1);
For j = 1 To 2 * i - 1
a = a + 1
Print Str(a);
Next j
Next i
End Sub
10、用For …Next语句编程，双击窗体后，在屏幕上显示如图：
Private Sub Form_DblClick()
For i = 1 To 3
Print Tab(11 - 3 * i);
For j = 2 To 10 Step 2
Print j;
Next j
Next i
End Sub
11、用For …Next语句编程，双击窗体后，在屏幕上显示如图：
Private Sub Form_Click()
For i = 1 To 3
x = 2 * i + 1
Print Tab(10 - 3 * i);
For j = 1 To 5
Print x;
Next j
Next i