如果需要講詳細(xì)一點(diǎn),那就加我QQ531412815
創(chuàng)新互聯(lián)從2013年創(chuàng)立,是專業(yè)互聯(lián)網(wǎng)技術(shù)服務(wù)公司,擁有項(xiàng)目網(wǎng)站設(shè)計(jì)、成都網(wǎng)站建設(shè)網(wǎng)站策劃,項(xiàng)目實(shí)施與項(xiàng)目整合能力。我們以讓每一個夢想脫穎而出為使命,1280元臨縣做網(wǎng)站,已為上家服務(wù),為臨縣各地企業(yè)和個人服務(wù),聯(lián)系電話:028-86922220
第4題,潛在的錯誤,這里的錯誤不是常規(guī)錯誤,屬于那種只有在運(yùn)行是才知道的錯誤:
Catch ex As Exception
MsgBox(ex.StackTrace)
'永遠(yuǎn)不會查找下面的錯誤
Catch ex As ArgumentNullException
MsgBox("Input Test box cannot be null.")
Catch ex As OverflowException
MsgBox("Input Test box 2 cannot be zero!")
Catch ex As FormatException
MsgBox("Input Test box should be numeric format!")
結(jié)構(gòu)化錯誤處理永遠(yuǎn)達(dá)不到下面這里,因?yàn)镃atch ex As Exception 已經(jīng)處理了所有錯誤.
第5題:
00123
1000 60.50
2000 60.00
3500 59.50
---- -----
6500 60.00
00124
3000 60.50
---- -----
3000 60.50
00125
2000 59.50
1000 58.00
---- -----
3000 58.75
就是按照Ref_ID 分類,有一種方法就是按照Ref_ID 分組,也就是使用SQL語言,不過這里需要該很多,
我就不用了,那么就稍微復(fù)雜一點(diǎn),使用FIND方法,不過有一點(diǎn)必須注意REF_ID必須排序,因?yàn)閿?shù)據(jù)庫中
已經(jīng)排好序了,我就不用排了。
Dim rst as ADODB.Recordset
dim refID as string
Rst = GetRecordset
Do While Not rst.EOF
refid=rst(0)
Console.writeline(rst.Fields("Ref_ID")
do
Console.writeline rst.Fields("Qty") vbcrlf rst.Fields("Price"))
rst.MoveNext()
loop while rst(0)=refid
Loop
第6題:就是從一個集合中取元素輸出的問題
比較簡單的辦法就是使用遞歸
以下是使用VB的方法(可以移植到VB.NET上,因?yàn)槲覍B.NET的數(shù)組到現(xiàn)在還不太會,所以就將就一下)
Dim bUse() As Boolean
Dim lStr() As String * 1
Dim nCount As Byte
-----------------------------------------------------------------------------------
Public Sub Combination(lstStr As String)
Dim i As Byte
Dim j As Byte
Dim StrLen As Byte
StrLen = Len(lstStr)
ReDim bUse(1 To StrLen) As Boolean
ReDim lStr(1 To StrLen) As String * 1
For i = 1 To StrLen
lStr(i) = Mid(lstStr, i, 1)
Next
For i = 1 To StrLen
nCount = i
GoWith StrLen, 1, 0, ""
Next
End Sub
------------------------------------------------------------------------------------
Public Sub GoWith(ECount As Byte, nStart As Byte, Deep As Byte, lastStr As String)
Dim i As Byte
If Deep = nCount Then
Debug.Print lastStr
Exit Sub
End If
For i = nStart To ECount
If Not bUse(i) Then
bUse(i) = True
GoWith ECount, i, Deep + 1, lastStr lStr(i)
bUse(i) = False
End If
Next
End Sub
--------------------------------------------------------------------------------------
Private Sub Form_Load()
Combination "wxyz"
End Sub
--------------------------------------------------------------------------------------
其中GOWITH是真正的遞歸函數(shù),而Combination是用來預(yù)處理字符的
全局變量:
BUSE:用來確定是否使用過這個元素
lSTR:用來保存字符元素
NCOUNT:用來限制遞歸函數(shù)的深度,換句話說,就是輸出元素組中的元素個數(shù)
實(shí)際測試成功,另外我對前三題很感興趣,希望能夠傳給我
1.編程求1!+3!+5!+....+n! N由inputbox獲取
Function Math(ByVal N As Integer) As Integer
Dim c As Integer = 1
For i = 1 To N
c *= i
Next
Return c
End Function
Dim N As String = InputBox("輸入N的值.")
If N = "" Then Return
MessageBox.Show(Math(N))
2.用最簡單的方法將個位數(shù)和十位數(shù)互換,一定要最簡單的方法..比如31換成13.
Dim s As String = InputBox("輸入一個十位數(shù).")
If s = "" Then Return
MessageBox.Show(StrReverse(s))
Imports System.Text.RegularExpressions
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim a As String = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
Dim g() As Char = a.ToCharArray
Dim MyRandom As New Random
Dim bs As String = ""
For i = 1 To 20
bs = g(MyRandom.Next(0, g.GetUpperBound(0) + 1))
Next
Dim gs() As String = (From mt As Match In Regex.Matches(bs, "[A-Z]") Select mt.Value).ToArray
System.Array.Sort(gs)
gs = (From mt As Match In Regex.Matches(Join(gs, ""), "([A-Z])\1*") Select mt.Value).ToArray
Dim g_len() As Integer
g_len = (From mt As Match In Regex.Matches(Join(gs, ""), "([A-Z])\1*") Select mt.Length).ToArray ' 使用數(shù)組元素作為計(jì)數(shù)器g_len
System.Array.Sort(g_len, gs)
Label1.Text = "出現(xiàn)次數(shù)最多的字母:" gs(gs.GetUpperBound(0)).Substring(0, 1) " 共出現(xiàn)" g_len(g_len.GetUpperBound(0)) "次" vbCrLf "沒有出現(xiàn)的字母是:" Join(a.Split(bs.ToCharArray), "")
End Sub
End Class
文章題目:vb點(diǎn)虐
大題 vbnet implements
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