C# Language Specification

2.Lexical structure 51

2.1Programs 51

2.2Grammars 51

2.2.1Grammar notation 51

2.2.2Lexical grammar 52

2.2.3Syntactic grammar 52

2.3Lexical analysis 52

2.3.1Line terminators 53

2.3.2Comments 53

2.3.3White space 54

2.4Tokens 55

2.4.1Unicode character escape sequences 55

2.4.2Identifiers 56

2.4.3Keywords 57

2.4.4Literals 58

2.4.4.1Boolean literals 58

2.4.4.2Integer literals 58

2.4.4.3Real literals 59

2.4.4.4Character literals 60

2.4.4.5String literals 61

2.4.4.6The null literal 63

2.4.5Operators and punctuators 63

2.5Pre-processing directives 63

2.5.1Conditional compilation symbols 64

2.5.2Pre-processing expressions 65

2.5.3Declaration directives 65

2.5.4Conditional compilation directives 66

2.5.5Diagnostic directives 69

2.5.6Region directives 69

2.5.7Line directives 70

2.5.8Pragma directives 70

2.5.8.1Pragma warning 71