不需要做任何修改的lex

这是扬创2440开发板的一个ADS环境下的一个测试程序,对初学者很有用的.-Jan 2440 This is a development board an ADS environment of a test procedure, useful for beginners.

类似vc的集成开发环境，包括编辑器，调试器，编译器的全部源代码，真正的交互式，支持代码自动生成技术-Vc similar integrated development environment, including the editor, debugger, compiler of all source code, a truly interactive, support automatic code generation technology

simple hello world example

这是一份实验报告，目的是掌握YACC的使用方法，了解YACC处理二义性的方法。 用YACC等工具生成如下文法表示的表达式对应的计算器 exp->exp + exp | exp - exp| exp * exp |exp / exp |exp ^ exp | - exp |(exp) |NUM 对于输入的表达式，能输出结果。比如: 3 +(4 *5)结果应为23 当出现错误时可以进行错误处理。 -This is a test report, the purpose is to master the use YACC to learn YACC handling of the ambiguity approach. Using tools such as YACC grammar that generates the following expression for the corresponding calculator exp-> exp+ exp | exp- exp | exp* exp | exp/exp | exp ^ exp |- exp | (exp) | NUM expression for the input type, can be output. For example: 3+ (4* 5) the result should be 23 when the error can be error-handling.

词法分析器（编译原理）- Morphology analyzer (translation principle)

Full support for extended regular expressions (those with intersection and complement); Support for some kinds of cycles in grammar; DFA-based operation; Unicode support; C++ only, requires a modern compiler; Lexical analyzers can be configured to get symbols from any input class (built-in support for std::istream, std::wistream and FILE *); Designed to work with Whale, but can work standalone or interface to other parsers.-Full support for extended regular expressions (those with intersection and complement); Support for some kinds of cycles in grammar; DFA-based operation; Unicode support; C only, requires a modern compiler; Lexical analyzers can be configured to get symbols from any input class (built-in support for std::istream, std::wistream and FILE*); Designed to work with Whale, but can work standalone or interface to other parsers.

拿出这个程序来主要是因为原文中只有一个LEX程序,- Puts out this procedure to come mainly is because in the original text only has a LEX procedure,

预测分析法实现的语法分析器 -Forecast and Analysis Method syntax analyzer Forecast and Analysis Method of Grammar Analyzer Forecast and Analysis Method syntax analyzer

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利用LEX生成工具构造PASCAL词法分析器。输入一个字符串或是数，分析器将判别是否为PASCAL标准标识符、保留字、整数或实数，并同时把当前的输入再次打印出来。-use LEX generation tool is PASCAL lexical analyzer. The importation of a string or number analyzer to determine whether it will PASCAL standard identifier and reserved word, integer or real, and while the current importation of printed again.