vb.net题目 vb试题库
VB.NET的题目哈 随机产生20个大写字母，求出现次数最多的字母及出现次数，还有求出现次数为0的字母有哪些
Imports System.Text.RegularExpressions
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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 ' 使用数组元素作为计数器g_len
System.Array.Sort(g_len, gs)
Label1.Text = "出现次数最多的字母：" gs(gs.GetUpperBound(0)).Substring(0, 1) " 共出现" g_len(g_len.GetUpperBound(0)) "次" vbCrLf "没有出现的字母是：" Join(a.Split(bs.ToCharArray), "")
End Sub
End Class
用VB.NET程序编写代码
Delphi代码如下：
procedure TForm1.Button1Click(Sender: TObject);
var
购物总价:Integer;
折扣:Extended;
begin
购物总价:=StrToInt(Edit1.Text);
if 购物总价250 then
begin
折扣:=0;
end
else if 购物总价500 then
begin
折扣:=0.05;
end
else if 购物总价1000 then
begin
折扣:=0.075;
end
else if 购物总价2000 then
begin
折扣:=0.1;
end
{
此段的折扣是多少？
else if 购物总价3000 then
begin
折扣:=0.05;
end
}
else if 购物总价=3000 then
begin
折扣:=0.15;
end;
ShowMessage('您享受的折扣是：'+FloatToStr(折扣)
+' 原价：'+IntToStr(购物总价)
+' 折后总价：'+FloatToStr(购物总价*(1-折扣)));
end;
vb.net 数组显示矩阵的一道题
'这是在vb6中的代码，在vb.net中基本差不多，你可以参考一下
Private Sub cmdCommand1_Click()
Me.AutoRedraw = True
Dim Grp
Grp = Array(1, 2, 3, 4, 5)
Dim i, j As Long
Dim StrPrt As String
For i = 0 To UBound(Grp)
'i为位移量
StrPrt = ""
For j = i To UBound(Grp)
StrPrt = StrPrt Grp(j)
Next j
For j = 0 To i - 1
StrPrt = StrPrt Grp(j)
Next j
Me.Print StrPrt
Next i
End Sub
VB.NET listbox 题目
For Each i In ListBox1.Items
If ListBox2.Items.Contains(i) = False Then
ListBox3.Items.Add(i)
End If
Next
VB.NET的题目 利用随机数生成两个4*4的矩阵A~~紧急紧急
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
MsgBox(Int(Rnd() * 10))
Dim n As Integer = 4
Dim i, a As Integer
Dim r As String
Randomize()
For i = 1 To n
r = Int(Rnd() * 10)
Label1.Text = Space(n - i + 1) StrDup(i, r) + vbNewLine
Next i
For i = n To 1 Step -1
r = Int(Rnd() * 10)
Label1.Text = Space(n - i + 1) StrDup(i, r) + vbNewLine
Next i
For Each c In Label1.Text
If IsNumeric(c) Then
a += 1
End If
Next
MsgBox(a) ‘主对角线和次对角线上各元素之和
End Sub
另一个矩阵也是用同样方法.
你说的是不是这样?
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