从网上下载lex工具源代码，并对其进行反复修改 使其能按我们的要求对C程序进行词法分析，然后输出我们期望的结果...

词法分析程序，可对以下的C源程序进行分析：main() {int a[12] ,sum for(i=1 i=1 j--){ if(i==j&&i+j==13)sum+=a[i][j] } } printf("%c",sum) }-lexical analysis procedures, right below the C source code analysis : main () (int a [12] [12], the sum for (i = 1 ilt; I = 12) (for (j = 1 JLT; J = 12) Scanf ( "% d", a [i] [j])) for (i = 12 IGT; a = i--) (for (j = 12 IGT; = 1 j--) (if (i == ji j == 13) sum = a [i] [j])) printf ( "% c", sum

编译原理中的First集与 Follow集生成程序，这是我用C＋＋语言写的，希望对大家有点用处。-Compiler Principle of First Set and Follow procedures set generation, which is my C++ languages, we hope to somewhat useful.

用ｃ语言实现的语法语义分析程序 实现了四元式得生成功能齐全-with language syntax semantic analysis of the program in four yuan-generation multifunctional

关于C编译起的源码，喜欢C++的朋友可以-On the C compiler from the source code, like C++" s friends can see

一个flex和bison用法入门的很好的例子。　按照词法分析,语法分析,语义分析的顺序来熟悉flex和bison这两个有力的工具。最后给出了一个用flex做词法分析用bison做语法分析设计的科学计算器（不同于一般程序设计中的入门级计算器），是学习编译原理的很好的例子。-a flex and bison portal usage of a very good example. According lexical analysis, parsing, Semantic analysis of the sequence to flex and bison familiar with these two powerful tool. Finally, a use flex do lexical analysis bison do syntax analysis and design of scientific calculators (unlike General Program Design"s entry-level calculators), compiler theory is the study of good examples.

HIGHLIGHT TRUE #define NOHIGHLIGHT FALSE #define UPDATE TRUE #define NOUPDATE FALSE #define FORMAT TRUE #define NOFORMAT FALSE #define LEFT 0-HIGHLIGHT# define NOHIGHLIGHT TRUE FALSE UPDATE# define TRUE## define FALSE de NOUPDATE fine FORMAT# define TRUE FALSE# defin NOFORMAT e LEFT 0

一个读单词过程，从输入的源程序中，识别出各个具有独立意义的单词，即基本保留字、标识符、常数、运算符、分隔符五大类。并依次输出各个单词的内部编码及单词符号自身值。（-read a word process, from the import of the source to identify all the independent significance of the word, that is to retain the basic character identifier, constant, Operators, separated top-five. Output and followed all the internal code words and symbols own words value. (

正规(则)表达式转化为NFA，DFA，DFA最小化，显示结果和过程-Formal (then) regular expressions into NFA, DFA, DFA minimization, and process the result will be displayed

单片机与PC机通信的程序，pc机程序用c语言来编写，单片机程序用汇编语言来编写-dfafdfa

系统地讲述了计算机语言的编译原理。如：编译器、词法分析、文法等-Systematically about the principles of computer language compiler. Such as: compiler, lexical analysis, grammar, etc.