43:. The program is written using characters that are defined by the lexical structure of the language used. The character set is equivalent to the alphabet used by any written language. The lexical grammar lays down the rules governing how a character sequence is divided up into subsequences of characters, each part of which represents an individual token. This is frequently defined in terms of
98:(plus whitespace tokens) because the space character terminates the sequence of characters forming the identifier. Further, certain sequences are categorized as
102:– these generally have the same form as identifiers (usually alphabetical words), but are categorized separately; formally they have a different token type.
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sequence (letters and digits, usually also allowing underscores, and disallowing initial digits), and that an
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Unescaped string literal (quote, followed by non-quotes, ending in a quote):
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Regular expressions for common lexical rules follow (for example, C).
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Object-oriented
Programming with Java: Essentials and Applications
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is a sequence of digits. So in the following character sequence
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214:. Addison-Wesley Professional. pp. 9–.
187:. Tata McGraw-Hill Education. pp. 57–.
16:Formal grammar defining the syntax of tokens
131:Decimal integer literal (no leading zero):
50:For instance, the lexical grammar for many
62:character and continues until a matching
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70:makes this more complicated), that an
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239:ANSI C grammar, Lex specification
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211:The Java Language Specification
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137:Hexadecimal integer literal:
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143:Octal integer literal:
208:James Gosling (2000).
52:programming languages
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54:specifies that a
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106:Examples
100:keywords
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259:Parsing
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74:is an
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