用VB怎么设计一个算术题出题程序？

补充：要用数组，产生随机数，加号减号也随机产生，之后怎么计算，还要判断正误，评分

答案：
Option Explicit
Dim Num1 As Integer, Num2 As Integer '两个操作数
Dim SExp As String
Dim Result As Single '计算结果
Dim NOk As Integer, NError As Integer '统计计算正确与错误数

Private Sub Command2_Click()
Me.Picture1.Cls
End Sub

Private Sub Form_Load() '通过产生随机数生成表达式
Dim NOp As Integer, Op As String * 1 '操作符  Randomize
'初始化随机数生成器
Num1 = Int(10 * Rnd + 1) '产生1-10之间的操作数
Num2 = Int(10 * Rnd + 1) '产生1-10之间的操作数
NOp = Int(4 * Rnd + 1) '产生1-4之间的操作代码
 Select Case NOp
  Case 1
   Op = "＋"
   Result = Num1 + Num2
  Case 2
   Op = "－"
   Result = Num1 - Num2
  Case 3
   Op = "×"
   Result = Num1 * Num2
  Case 4
   Op = "÷"
   Result = Num1 / Num2
 End Select
SExp = Num1 & Op & Num2 & "="
Label1 = SExp
End Sub

Private Sub Text1_KeyPress(KeyAscii As Integer)
 If KeyAscii = 13 Then
  If Val(Text1) = Result Then
   Picture1.Print SExp; Text1; Tab(10); "√ " '计算正确
   NOk = NOk + 1
  Else
   Picture1.Print SExp; Text1; Tab(10); "×" '计算错误
   NError = NError + 1
  End If
  Text1 = ""                                '下一个表达式生成
  Text1.SetFocus
  Form_Load
 End If
End Sub
  Private Sub Command1_Click()
  On Error Resume Next
  Label1 = ""
  Picture1.Print "----------------------------------"
  Picture1.Print "一共计算 " & (NOk + NError) & " 道题,";
  Picture1.Print "得分 " & Int(NOk / (NOk + NError) * 100)
  End Sub
 算术题 
dim a,b,c
a=1
b=1
c=a+b
msgbox c
Dim Answer As Integer
Private Sub Command1_Click()
Dim num(1 To 4) As Integer
Dim count(1 To 3) As String
Dim s
Me.Cls
For i = 1 To 4
    num(i) = Int(Rnd * 10)
Next i
Answer = num(1)
For i = 1 To 3
    count(i) = Int(Rnd * 2)
    Select Case (count(i))
    Case 0
        count(i) = "+"
        Answer = Answer + num(i + 1)
    Case 1
        count(i) = "-"
        Answer = Answer - num(i + 1)
    End Select
    s = s & num(i) & count(i)
Next i
s = s & num(4)
Print "请计算" & s & 的值
End Sub

Private Sub Command2_Click()
If Val(Text1.Text) = Answer Then
    MsgBox "回答正确"
Else
    MsgBox "回答错误 答案为" & Answer
End If
End Sub

'command1 为生成 题目 command2为 判断正误 text1 为 输入 答案
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