Description: , 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:+-*/
- [preprocess] - downloaded from the Internet from the we
- [12] - This the regular test pen questions: wri
- [dnp] - Statute DNP3.0 communications programmin
- [Lex] - 1. Analysis of the input file 2. Regular
File list (Check if you may need any files):
Download