小李編寫(xiě)一個(gè)統(tǒng)計(jì)學(xué)生選考科目的VB程序,算法的基本思想是:檢查每位學(xué)生選課組合的編碼是否有效,對(duì)有效選擇結(jié)果進(jìn)行科目統(tǒng)計(jì),根據(jù)各科次占有效人數(shù)的百分率求出各科排名.程序運(yùn)行時(shí),單擊“顯示”按鈕Command1,學(xué)生選課數(shù)據(jù)顯示在列表框list1中,各科編號(hào)及對(duì)應(yīng)科目名稱(chēng)顯示列表框list2中,單擊“統(tǒng)計(jì)”按鈕Command2,選課結(jié)果按各科百分率由高到低顯示在列表框list3中,程序運(yùn)行結(jié)果如圖所示.
實(shí)現(xiàn)上述功能的VB程序如下,請(qǐng)回答下列問(wèn)題:
(1)學(xué)生選課的編碼數(shù)據(jù)存儲(chǔ)在數(shù)據(jù)表中,其字段名為
subject
subject
.
(2)請(qǐng)?jiān)跈M線(xiàn)處填入合適的代碼.
Dim ach(1 to 500)As String’存儲(chǔ)各學(xué)生選課編碼
Dim bno(1 to 10)As Integer’存儲(chǔ)各科目編號(hào)
Dim bname (1 to 10)As String’存儲(chǔ)各科目名稱(chēng)
Dim bnum(1 to 10)As Integer’存儲(chǔ)各科目被選次數(shù)
Dim bmc(1 to 10)As Integer’存儲(chǔ)各科目被選的名次
Dim n As Integer,num As Integer
Private Sub Commandl
-Click( ?。?br /> Dim i As Integer,km As String
km=“物理化學(xué)生物政治歷史地理技術(shù)“
Dim cn As New ADODB.Connection,rs As New ADODB.Recordset,spl As String
cn.Open“provider=Microsoft.oledb.4;Data Source=“+App.Path+“\students.mdb“
rs.Open“select*from choose“,cn
Do Whole 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 TR(bno(i))+“---“+bname(i)
Next i
End Sub
Private Sub Command2
-Click( ?。?br /> 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=1 to 3
c=Mid(ach(i),j,1)
bnum(Val(c))=
bnum(Val(c))+1
bnum(Val(c))+1
Next j
num=num+1
End If
Next i
i=1
Do While i<=7’該循環(huán)得到各學(xué)科被選人數(shù)的名次
bmc(i)=1
For j=1 to 7
If bnum(j)>bnum(i) Then
bmc(i)=bmc(i)+1
bmc(i)=bmc(i)+1
Next j
i=i+1
Loop
For i=1 to 7
For j=1 to 7
If
i=bmc(j)
i=bmc(j)
Then
per=In(bnum(j)*100/num*100)/100
List3.AddItem Str(bno(j))+“---“+Str(per)+“%“
End If
Next i
End Sub
Function check(s As String) As Boolean
’代碼略!若學(xué)生選代碼有效,函數(shù)返回True,否則返回False
End Function.