VB.net編寫一個控制臺應用程序用來從鍵盤上輸入兩個數(shù)然后輸出這兩個數(shù)的和差積商

應該定義為double或者single，string類好像不能進行運算。我簡單說一下控制臺的方法，你要一次性輸入和差積商，首先聲明兩個變量用來儲存兩個數(shù)，然后用算法一次性輸出結果就ok。

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Sub Main()

Dim FN As Single

Dim SN As Single

Dim ResultNum As Single

Console.WriteLine("請輸入第一個數(shù)") : FN = Console.ReadLine

Console.WriteLine("請輸入第二個數(shù)") : SN = Console.ReadLine

ResultNum = FN + SN

Console.WriteLine("它們的和: " ResultNum)

ResultNum = FN - SN

Console.WriteLine("它們的差: " ResultNum)

ResultNum = FN * SN

Console.WriteLine("它們的積: " ResultNum)

ResultNum = FN / SN

Console.WriteLine("它們的商: " ResultNum)

Console.ReadLine()

End Sub

vb.net 統(tǒng)計時間段內(nèi)數(shù)據(jù)庫字段金額和

加一個按鈕，代碼如下：

Imports System.Data.OleDb

Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim myConn As OleDbConnection = New OleDbConnection '聲明并實例化數(shù)據(jù)庫連接對象

Dim myadpt As New OleDbDataAdapter '聲明并實例化數(shù)據(jù)適配器對象

Dim myds As New DataSet '聲明并實例化記錄集對象

Dim myConnection As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" Application.StartupPath "\DB\SJ.mdb" '數(shù)據(jù)庫連接字符串

myConn.ConnectionString = myConnection '設置數(shù)據(jù)庫連接對象的數(shù)據(jù)庫連接字符串屬性

myConn.Open() '啟動數(shù)據(jù)庫連接

myadpt.SelectCommand = New OleDbCommand '聲明數(shù)據(jù)適配器的查詢命令對象

myadpt.SelectCommand.CommandText = "select sum(支出金額) as 支出金額 from zcb where 支出時間 like '" Text1.Text "%' " '給數(shù)據(jù)適配器的查詢命令屬性賦值

myadpt.SelectCommand.Connection = myConn '設置據(jù)適配器與數(shù)據(jù)庫連接對象的連接

myadpt.Fill(myds)

Text13.Text = myds.Tables(0).Rows(0)("支出金額")

End Sub

End Class

VB中如何計算數(shù)值數(shù)組中各元素值之和

軟糖來回答吧，vb.net用循環(huán)是這樣的

dim k = new integer(9) {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}

dim 和 as integer

for i = 0 to k.count - 1

和 += k(i)

next計算數(shù)組中各元素之和更簡單的方法是

使用擴展方法sum或者lambda表達式，以下兩種均可

dim 和1 = k.sum()

dim 和2 = k.aggregate(function(m, n) m + n)

用vb.net設計程序完成1、2、3……30 自然序列中偶數(shù)的累加值。結果送至變量Sum(程

Dim sum As Integer

For i = 1 To 30

If i Mod 2 = 0 Then

sum = sum + i

End If

Next

誰知道用VB.net怎么編寫1到100累加的程序

html

head

meta http-equiv="Content-Type" content="text/html; charset=utf-8" /

title1到100之和/title

/head

script language="javascript"

!--

sum=0

for(i=1;i=100;i++)

{

sum=sum+i;

}

document.write("1到100之和為："+sum)

--

/script

body

/body

/html