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      • c#教程之簡單類型

      • 2015-01-21 20:23 來源:未知

      1.4.1 簡單類型

      (相關C#教程)

      簡單類型也是結構類型,因此有構造函數、數據成員、方法、屬性等,因此下列語句int i=int.MaxValue;string s=i.ToString()是正確的。即使一個常量,C#也會生成結構類型的實例,因此也可以使用結構類型的方法,例如:string s=13.ToString()是正確的。簡單類型包括:整數類型、字符類型、布爾類型、浮點數類型、十進制類型。見下表:
      保留字 System命名空間中的名字 字節數 取值范圍
      sbyte System.Sbyte 1 -128~127
      byte System.Byte 1 0~255
      short System.Int16 2 -32768~32767
      ushort System.UInt16 2 0~65535
      int System.Int32 4 -2147483648~2147483647
      uint System.UInt32 4 0~4292967295
      long System.Int64 8 -9223372036854775808~9223372036854775808
      ulong System.UInt64 8 0~18446744073709551615
      char System.Char 2 0~65535
      float System.Single 4 3.4E-38~3.4E+38
      double System.Double 8 1.7E-308~1.7E+308
      bool System.Boolean   (true,false)
      decimal System.Decimal 16 正負 1.0×10-28 到7.9×1028之間
      C#簡單類型使用方法和C、C++中相應的數據類型基本一致。需要注意的是:
      C語言不同,無論在何種系統中,C#每種數據類型所占字節數是一定的。
      字符類型采用Unicode字符集,一個Unicode標準字符長度為16位。
      整數類型不能隱式被轉換為字符類型(char),例如char c1=10是錯誤的,必須寫成:char c1=(char)10,char c='A'char c='\x0032';char c='\u0032'
      布爾類型有兩個值:false,true。不能認為整數0是false,其它值是true。bool x=1是錯誤的,不存在這種寫法,只能寫成x=true 或x=false
      十進制類型(decimal)也是浮點數類型,只是精度比較高,一般用于財政金融計算。
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