题目

小李编写一个统计学生选考科目的VB程序，算法的基本思想是：检查每位学生选课组合的编码是否有效，对有效选择结果进行科目统计，根据各科次占有效人数的百分率求出各科排名。程序运行时，单击“显示”按钮Commmad1，学生选课数据显示在列表框list1中，各科编号及对应科目名称显示列表框list2中，单击“统计”按钮Commmad2，选课结果按各科百分率由高到低显示在列表框list3中，程序运行结果如图所示。实现上述功能的VB程序如下，请回答下列问题 Dim ach(1 To 500) As String '存储各学生选课编码 Dim bno(1 To 10) As Integer '存储各科目编号 Dim bname(1 To 10) As String '存储各科目名称 Dim bnum(1 To 10) As Integer '存储各目被选次数 Dim bmc(1 To 10) As Integer '存储各科目被选的名次 Dim n As Integer, num As Integer Private Sub Command1_ Click() Dim i As Integer, km As String. km="物理化学生物政治历史地理技术" Dim cn As New ADODB. Connection, rs As New ADODB. Recordset, sql As String cn. Open "provider = Microsoft. Jet.oledb. 4. 0; Data Source="+App. Path +"\students. mdb" rs. Open " select * from choose", cn Do While Not rs. EOF n=n+1 : ach(n)=rs. Fields( "subject") : rs. MoveNext Loop rs. Close : cn. Close Set rs= Nothing Set cn= Nothing For i=1 To 7 bno(i)=i : bname(i)= Mid(km, (i- 1) * 2 + 1, 2) List2. AddItem Str(bno(i)) + "---" + bname(i) Next i End Sub Private Sub Command2_ Click( ) Dim i As Integer, j As Integer, k As Integer Dim c As String, per As Integer For i=1 To n If check(ach(i))= True Then For j=1To 3 c= Mid(ach(i), j, 1) bnum(Val(c)) = ① Next j num= num+1 End If Next i i= 1 Do While i<=7 '该循环得到各学科被选人数的名次 bmc(i)= 1 For j=1 To 7 If bnum(j) > bnum(i) Then ② Next j i=i+1 Loop For i=1 To 7 For j=1 To 7 If ③ Then per= Int( bnum(j) * 100 / num *100) / 100 List3. AddItem Str( bno(j))+"---”+ bname(j) + "---" + Str(per) +"%" End If Next j Next i End Sub Function check(s As String) As Boolean '代码略！若学生选科代码有效，函数返回True，否则返回False End Function （1）学生选课的编码数据存储在数据表中，其字段名为。（2）请在划线处填入合适的代码。 ① ② ③ 答案：【1】subject 【1】bnum( Val(c))= bnum(Val(c)) + 1【2】bmc(i)= bmc(i)+1【3】i= bme(j)

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