vb编程实例

下面的代码是利用三边计算三角形面积

Private Sub Command1_Click()

a=val(text1.text)

b=val(text2.text)

c=val(text3.text)

p=(a+b+c)/2

s=sqr(p*(p-a)*(p-b)*(p-c))

if a+b>c and b+c>a and a+c>b then

text4.text="三角形的面积是:" &s

else

text4.text="不能构成三角形"

end if

end sub

下面是计算两数之和的代码

private sub command1_click()

a=val(text1.text)

b=val(text2.text)

text3.text=a+b

end sub

使用access数据库，将所有题都事先输入在题库中，在软件运行过程中从题库中随即抽取题目，输出到窗体上！

比如试题表Question

可能会有的字段

字段 类型 备注

ID int 自增量

Content string 问题描述

Type byte 问题类型,1填空题，2选择题，3问答题

大概这些，可能根据出的问题不同有更详细字段

背景音乐你可以给窗体上放一个windows media player控件，设置为不可见，然后让这个控件放歌就可以了！

'添加一个名为label1的标签控件，并将其index设为0；再添加一个名为command1的按钮控件

Dim a(1 To 9) As Boolean

Dim win As Boolean, begin As Boolean, haveload As Boolean, start As BooleanPrivate Sub Command1_Click()

start = True: begin = False

For i = 1 To 9

a(i) = False

Next i

Form_Load

End SubPrivate Sub Form_Load()

a(9) = True

Label1(0).Visible = False

Me.Height = 4400

Me.Width = 4000

Scale (0, 0)-(3, 3.3)

If haveload = False Then

haveload = True: start = True

Command1.Top = 3: Command1.Left = 2

Command1.Width = 1: Command1.Height = 0.3

Command1.Caption = "开始"

For i = 1 To 9

Load Label1(i)

Next i

End If

For i = 1 To 9

Label1(i).Height = 1

Label1(i).Width = 1

Label1(i).Visible = True

Label1(i).Top = (i - 1) \ 3

Label1(i).Left = (i - 1) Mod 3

Label1(i).Caption = Str(i)

Label1(i).BackColor = QBColor(i)

Label1(i).FontBold = True

Label1(i).FontSize = 40

Next i

Label1(9).Caption = "": Label1(9).BackColor = vbWhite

Randomize

For i = 1 To 500

r% = Int(9 * Rnd) + 1

Call Label1_Click(r)

Next i

begin = True

End SubPrivate Sub Label1_Click(index As Integer)

Dim x1 As Integer, y1 As Integer

If start = True Then

If a(index) = False Then

x1 = (index - 1) Mod 3: y1 = (index - 1) \ 3

If x1 - 1 >-0.2 Then

If a(x1 + y1 * 3) = True Then Call yidong(x1 + y1 * 3, index)

End If

If x1 + 1 <2.2 Then

If a(x1 + y1 * 3 + 2) = True Then Call yidong(x1 + y1 * 3 + 2, index)

End If

If y1 - 1 >-0.2 Then

If a(x1 + 1 + (y1 - 1) * 3) = True Then Call yidong(x1 + (y1 - 1) * 3 + 1, index)

End If

If y1 + 1 <2.2 Then

If a(x1 + 1 + (y1 + 1) * 3) = True Then Call yidong(x1 + 1 + (y1 + 1) * 3, index)

End If

End If

win = True

For i = 1 To 8

If Val(Label1(i).Caption) <>i Then win = False

Next i

If win = True And begin = True Then MsgBox ("恭喜你成功了"): begin = False: start = False

End If

End Sub

Sub yidong(x, index)

Label1(0).Caption = Label1(index).Caption

Label1(index).Caption = Label1(x).Caption

Label1(x).Caption = Label1(0).Caption

a(index) = True: a(x) = False

Label1(0).BackColor = Label1(index).BackColor

Label1(index).BackColor = Label1(x).BackColor

Label1(x).BackColor = Label1(0).BackColor

End Sub

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