Jon Jagger
jon@jaggersoft.com
Table of Contents 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Notes DownloadECMA-334 C# Language Specificationpreviousnextprevious at this levelnext at this level 9 Lexical structureprevious at this levelnext at this level 9.4 Tokensprevious at this levelnext at this level 9.4.1 Unicode escape sequences Paragraph 11 A Unicode escape sequence represents a Unicode character. 2 Unicode escape sequences are processed in identifiers (§9.4.2), regular string literals (§9.4.4.5), and character literals (§9.4.4.4). 3 A Unicode character escape is not processed in any other location (for example, to form an operator, punctuator, or keyword). unicode-escape-sequence :: \u hex-digit hex-digit hex-digit hex-digit \U hex-digit hex-digit hex-digit hex-digit hex-digit hex-digit hex-digit hex-digit Paragraph 21 A Unicode escape sequence represents the single Unicode character formed by the hexadecimal number following the "\u" or "\U" characters. 2 Since C# uses a 16-bit encoding of Unicode characters in characters and string values, a Unicode character in the range U+10000 to U+10FFFF is represented using two Unicode surrogate characters. 3 Unicode characters with code points above 0x10FFFF are not supported. Paragraph 31 Multiple translations are not performed. 2 For instance, the string literal "\u005Cu005C" is equivalent to "\u005C" rather than "\". [Note: The Unicode value \u005C is the character "\". end note] [Example: The example
class Class1  
{  
   static void Test(bool \u0066) {  
      char c = '\u0066';  
      if (\u0066)  
      System.Console.WriteLine(c.ToString());  
   }     
}  
shows several uses of \u0066, which is the escape sequence for the letter "f". The program is equivalent to
class Class1  
{  
   static void Test(bool f) {  
      char c = 'f';  
      if (f)  
      System.Console.WriteLine(c.ToString());  
   }     
}  
end example]
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