Private Sub Command1Click()
Dim a(1 To 4) As Integer
Dim i As Integer
a(1) = 1
For i = 2 To 4
a(i) = 2 * a(i - 1) + 1
Next i
List1.AddItem Str(a(i))
End Sub
Const n=3500 ’存储单词的总数
Dim a(1 To n)As String ’依次存储每个英语单词
Dim b(1 To n) As Strin9 ’依次存储每个英语单词的中文含义
Private Sub Command1_Click()
Dim Conn As New ADODB.Connection
Dim rs As New ADODB.Recordset
Dim strSQL As String
conn.ConnectionString=“Provider=Microsoft.ACE.OLEDB.12.0;Data source=”&App.Path&“\dictionary1.accdb”
strSQL=”select*from list”
conn.Open
Set rs.ActiveConnection=conn
rs.Open strSQL
num=0
Do While Not rs.EOF
num=num+1
a(mum)=rs.Fields(“英语单词”)
b(num)=rs.Fields(“中文含义”)
rs.MoveNext
Loop
rs.Close
conn.Close
Set rs=Nothing
Set conn=Nothing
For i==1 To n
List1.AddItem a(i)+“ ”+b(i)
Next i
End Sub
Private Sub Command2_Click()
Dim s As String
S=Text1.Text
If search(s)=-1 Then
Text2.text=“找不到该单词”
Else
Text2.Text= ①
End If
End Sub
Function search(key As String)As Integer
Dim i,j As Integer
Dim mid1,mid2 As Integer
i=1:j=n
search=-1
Do While i<=j
mid1=Int(j+(j—i)/3)
mid2=Int(j-(j-i)/3)
If key=a(mid1)Then
search=mid1
Exit Do
ElseIf key<a(mid1)Then
j=mid1-1
ElseIf key=a(mid2)Then
search=mid2
Exit Do
Elself key>a(mid2)Then
i=mid2+1
Else
i=mid1+1
②
End If
Loop
End Function
① ②
a(l) = "Java": a(2) = 〃VB": a(3) = "Swift"
a⑷="Pascal": a(5) = "Python": a(6) = "Delphi
For i = 1 To 3
For j = 1 To 6 - i
If a(j) > a(j + 1) Then
t = a(j): a(j) = a(j + 1): a(j + 1) = t
End If
Next j
Next i
执行该程序段后,数组a(1)到a(6)的数据依次是( )
s = 1/2 + 2/3 : t = 1: b = 2
For i= 3 To 10
Next i
Label1.Caption = "前10项的和是:" + Str(s)
方框中的代码由以下四部分组成:
①b = r ②t = b ③r = t + b ④s = s + r/(r + b)
代码顺序正确的选项是( )
数组dzb_h的16个元素分别存放16进制数的16个基本数码。
依次取出原始颜色代码中每一位对应的16进制数码,例如原始颜色代码为#123456,第1次取出1,第2次取出2……
在数组dzb_h各元素中找到对应16进制数码的元素
运用规律:0+F=1+E…=7+8取得反相色并累加,例如:数组dzb_h第1个元素值的反相色的值是数组dzb_h第16个元素值。
输出得到的反相色。
实现上述功能的VB程序代码段如下,请完善相关程序代码。
Private Sub fx_cmd_Click()
Dim dzb_h(1 To 16) As String
Dim o_c As String, f_c As String, i As Integer, xbxh As Integer, c As String
dzb_h(1)="0":dzb_h(2)="1":dzb_h(3)="2":dzb_h(4)="3":dzb_h(5)="4":dzb_h(6)="5":dzb_h(7)="6"
dzb_h(8)="7":dzb_h(9)="8":dzb_h(10)="9":dzb_h(11)="A":dzb_h(12)="B":dzb_h(13)="C"
dzb_h(14)="D":dzb_h(15)="E":dzb_h(16)="F"
o_c=o_c_txt.Text
f_c="#"
Do While i<=Len(o_c)
c=Mid(o_c,i,1)
If Asc(c)>96 Then
xbxh=1
Do While xbxh<17
If Then
f_c=
Exit Do
End If
xbxh=xbxh+1
Loop
i=i+1
Loop
f_c_lab.Caption=f_c
End Sub
a(1) |
a(2) |
a(3) |
…… |
a(n-2) |
a(n-1) |
a(n) |
3 |
25 |
38 |
…… |
55 |
31 |
12 |
依据对分查找思想,设计一个在数组a中查找数据key的程序,实现该功能的VB程序如下,但加框处代码有错,请改正。
Private Sub Commandl_Click()
Const n = 6
Dim a(1 To n)As Integer,flag As Boolean
Dim I As Integer,j As Integer,m As Integer,key As Integer
'读取一组正整数,按上述规则存如数组a中,代码略
key = Val(Text1.Text)
i = l
j =(n + 1)\2
flag = False
Do While And Notflag '(1)
m = (i+j)\ 2
If key = a(m)Then
flag = True
ElseIf key < a(m)Then
j = m - 1
Else
i= m + 1
End If
Loop
If Not flag And j >0 Then
m= '(2)
If key = a(m)Then flag =True
End If
If flag Then
Text2.Text = Str(m)
Else
Text2.Text = "找不到"
End If
End Sub
⑴ ⑵
For i=1 To n\2
iMax= i:iMin= i
For j=i+ 1 To n-i+1
If a(j) > a(iMax) Then iMax=j
If a(j) < a(iMin) Then iMin=j
Next j
If iMax= i Then
Else
End If
Next i
上述程序段中方框处可选语句为:
①temp=a(i):a(i)=a(iMin):a(iMin)=temp
②temp=a(iMin):a(iMin)=a(n-i+1):a(n-i+1)=temp
③temp=a(iMax):a(iMax)=a(n-i+1):a(n-i+1)=temp
则方框处的语句依次为( )
①在打印机里打印相关的文本或者数字等
②可以用来画图
③在屏幕中输出相应的文本或者数字等
④执行语句print(“python”,3.7)时会出错
输入s=“101001”,b=0,执行这部分流程后,输出b的结果是( )
a=5;b=4
a%=2
b//=3
c=a+b
程序执行后,c的值为( )