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      • vb.net教程之數據類型

      • 2015-01-24 15:45 來源:未知

      數據類型(相關vb.net教程)
      數據是分類型的,不同類型的數據占用不同的長度的內存單元:同時指示了可進行的運算.

      以下VB2005中的基本的數據類型:

      1.數值類型

      a)         整形:Integer  Long
      b)        實形:Double

      2.日期類型:date

              Dim d As Date
              d = #3/12/2006 12:23:34 PM#
              MsgBox(d)
      或:
      d = DateAndTime.DateString & " " & DateAndTime.TimeString
      d= DateAndTime.TimeString
       
       
      n  ##           日期常數必須用##定界符,格式:月/日/年 時:分:秒
      n  DateAndTime 時間日期對象 提供一組對時間和日期進行處理的對象

       
      n  可以取得時間日期的其他對象: Date 對象,dateTime對象  Now()函數

      3.字符串類型:String

              Dim s1 As String, s2 As String, ss As String
              s1 = "A"
              s2 = "B"
              ss = s1 & s2
              MsgBox(ss)
       
      n  ""  常數必須用""定界符
      n  & 連接符 將任意類型數據連接字字符串
      ? 請將年月日相連顯示,如:2008-9-8

      4.邏輯類型:Boolean


       
       

      其他類型

      n  對象類型:Object:可以保存任何類型的數據
      n  枚舉類型Enum
             
             
       

      注意:Enum類型必須定義在所有過程之外。

      自定義類型:結構類型 Structure

      續行語句   _
      注釋語句   ‘
      字符串連接 &
      并行連接  :
      Public Class Form1
          Structure Student
              Dim Name As String      '學生姓名
              Dim Sex As Boolean      '性別
              Dim ClassName As String '班級
              Dim No As Integer       '學號
          End Structure
       
          Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) _
       Handles Button1.Click
              Dim s As Student, TestStr As String
              s.Name = "張三"
              s.Sex = True
              s.ClassName = "計算機"
              s.No = 1
       
              TestStr = s.Name & vbCrLf & s.Sex & vbCrLf & _
                          s.ClassName & vbCrLf & s.No
              MsgBox(TestStr)
          End Sub
      End Class
       
       
      VB數據類型列表
      類型名 長度 取值范圍
      Boolean 取決于實現平臺 True 或者 False
      Byte 1 個字節 0 到 255(無符號)
      Char(單個字符) 2 個字節 0 到 65535(無符號)
      Date 8 個字節 0001 年 1 月 1 日午夜 0:00:00 到 9999 年 12 月 31 日晚上 11:59:59
      Decimal 16 個字節 0 到 +/-79,228,162,514,264,337,593,543,950,335 (+/-7.9...E+28) ,不包含小數點;0 到 +/-7.9228162514264337593543950335,包含小數點右邊 28 位 最小非零數為 +/-0.0000000000000000000000000001 (+/-1E-28)
      Double(雙精度浮點型) 8 個字節 對于負值,為 -1.79769313486231570E+308 到 -4.94065645841246544E-324 對于正值,為 4.94065645841246544E-324 到 1.79769313486231570E+308
      Integer 4 個字節 -2,147,483,648 到 2,147,483,647(有符號)
      Long(長整型) 8 個字節 -9,223,372,036,854,775,808到 9,223,372,036,854,775,807 (9.2...E+18 †)
      Object 4 個字節(32 位平臺上) 8 個字節(64 位平臺上) 任何類型都可以存儲在 Object 類型的變量中
      SByte 1 個字節 -128 到 127(有符號)
      Short(短整型) 2 個字節 -32,768 到 32,767(有符號)
      Single(單精度浮點型) 4 個字節 對于負值,為 -3.4028235E+38 到 -1.401298E-45 †對于正值,為 1.401298E-45 到 3.4028235E+38 †
      String(變長) 取決于實現平臺 0 到大約 20 億個 Unicode 字符
      UInteger 4 個字節 0 到 4,294,967,295(無符號)
      ULong 8 個字節 0 到 18,446,744,073,709,551,615 (1.8...E+19 †)(無符號)
      UShort 2 個字節 0 到 65,535(無符號)
       
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