VB上机考试 习题以及答案_vb上机考试试题及答案

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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 *(99910 + 1)+ 10)Print a;s = s + a Next i Print 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 Sub4、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 *(991 For j = 1 To 251 + 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、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(113 * i);For j = 1 To 5 Print x;Next j Print Next i End Sub12、从文本框输入一个正整数，判断该数是否为素数。Dim a As Long Private Sub Form_Click()a = Val(Text1.Text)If a = 2 Then Tag = True ElseIf a Mod 2 = 0 Then Tag = False Else Tag = True For i = 3 To Sqr(a)Step 2 If a Mod i = 0 Then Tag = False: Exit For Next i End If If Tag = True Then Print a;“是素数” Else Print a;“不是素数” End If

End Sub13、利用随机函数产生并显示10个3位数的正整数，找出其中的最大数。Option Explicit Dim i%, max%, loc% Dim a(1 To 10)As Integer Private Sub Form_Click()Randomize Form1.Cls For i = 1 To 10 a(i)= Int(Rnd *(9991000 + 1)+ 1000)Print a(i)Next i min = 9999 For i = 1 To 10 If a(i)

15、当按下鼠标左键时，窗体的背景色变为红色；松开鼠标左键时，窗体的背景色变为绿色。Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)If Button = 1 Then Form1.BackColor = vbRed

End Sub

Private Sub Form_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single)If Button = 1 Then Form1.BackColor = vbGreen End Sub16、编制一个时钟程序，如下图

：Option Explicit

Private Sub Form_Load()Label1.BackColor = vbWhite Label1.BorderStyle = 1 Label1.Alignment = 2 Timer1.Enabled = True Timer1.Interval = 1000 End Sub

Private Sub Timer1_Timer()Label1.Caption = Time End Sub17、从键盘输入10个数，按输入的顺序和按输入顺序相反的顺序输出。Option Explicit Dim i% Dim a(1 To 10)As Single Private Sub Form_Click()For i = 1 To 10 a(i)= Val(InputBox(“请输入第” & i & “个数”))Print a(i);Next i Print For i = 10 To 1 Step-1 Print a(i);Next i

End Sub18、计算圆面积的程序。程序运行时，单击窗体，然后在下图所示的输入框中输入圆的半径，即可在窗体上显示计算出的圆面积。

Option Explicit Dim r%, a As Single Const pi As Single = 3.14159 Private Sub Form_Click()r = Val(InputBox(“请输入圆半径” & vbCrLf & “（1-9）：”, “输入”, 5))a = pi * r ^ 2 Print “半径为”;r;“的圆面积为”;a End Sub19、编写一个时钟程序，当选择“24小时”时，以24小时的方式显示如A，当选择“12小时”时，以12小时的方式显示如B。

Private Sub Form_Load()Timer1.Interval = 1000 End Sub

Private Sub Timer1_Timer()Select Case True Case Option1.Value Label1.Caption = Time Case Option2.Value Label1.Caption = Format(Time, “HH:MM:SS AM/PM”)End Select End Sub 20、设计一个程序，用户界面如图所示。程序运行后，用户在文本框中输入一段文字，然后按需要单击选择框，用以改变文本的字体、字型、颜色以及大小。

Option Explicit

Private Sub Check1_Click()If Check1.Value = 1 Then Text1.FontName = “黑体” Else Text1.FontName = “宋体” End If End Sub

Private Sub Check2_Click()If Check2.Value = 1 Then Text1.FontUnderline = True Else Text1.FontUnderline = False End If End Sub

Private Sub Check3_Click()If Check3.Value = 1 Then Text1.FontSize = 20 Else

Text1.FontSize = 9 End If End Sub

Private Sub Check4_Click()If Check4.Value = 1 Then Text1.ForeColor = vbGreen Else Text1.ForeColor = vbBlack End If End Sub

Private Sub Command1_Click()Text1.Text = “” End Sub

Private Sub Command2_Click()End End Sub 20做出2个周期的正弦波形.Private Sub Form_Click()Dim i%, x#, y# Const pi As String = 3.1415926 Form1.Scale(-2 * pi, 1.2)-(2 * pi,-1.2)Form1.Line(-2 * pi, 0)-(2 * pi, 0)Form1.Line(0, 1.2)-(0,-1.2)For x =-2 * pi To 2 * pi Step 0.01

y = Sin(x)

Form1.PSet(x, y)Next x End Sub 21以窗体为中心,产生1000个半径颜色随机的同心圆.Private Sub Form_Click()For i = 1 To 1000

x = Form1.ScaleWidth / 2

y = Form1.ScaleHeight / 2

r = Int(Rnd * y)

c = RGB(255 * Rnd, 255 * Rnd, 255 * Rnd)

Form1.Circle(x, y), r, c Next End Sub 22.九九乘法表 Private Sub Form_Click()Dim i%, j% Form1.Caption = “九九乘法表” Print Tab(48);Caption Print Tab(48);“-------------” For i = 1 To 9

For j = 1 To i

Print Tab((j-1)* 12 + 1);i;“*”;j;“=”;i * j;

Next j Print Next i End Sub 23求最大公约数和最小公倍数 Private Sub Command2_Click()Text1.Text = “” End Sub

Private Sub command1_Click()Dim m%, n%, r%, t% m = Val(Text1.Text)n = Val(Text2.Text)If m

r = m Mod n

m = n

n = r Loop Until r = 0 Text3.Caption = “公约数:” & m Text4.Caption = “公倍数” & t / m End Sub 24.用随机函数产生50个两位数,保存于一个一维数组中,要求找出其中的最大值,最小值及所在位置.