, Which require at least a lexical analyzer can identify the following types of words: a. Keyword: else if int return void while a total of six, all keywords are reserved words and must be lowercase b. Identifier: Identification and C language provides consistent lexical identifiers, through the definition of the following regular expression: ID = letter (letter | digit)* c. Constants: NUM = (+ |- | Ε) digit digit* (. Digit digit* | ε) (e (+ |- | Ε) digit digit* | ε), letter = a | .. | z | A | .. | Z |, digit = 0 | .. | 9, including integer, such as 123,-123,+ 123, etc. decimals, such as 123.45,+ 123.45,-123.45 science express constant counting method, such as+ 1.23e3,-2.3e-9 d. Special symbols:+-*/

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wordanalysis.txt

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