x.c

一个模拟flex的应用程序 主要实现词法分析 语义分析

%{
/* Lex program to produce a program that capitalizes all reserved words 
 * outside of commnents in a C program */
#include<stdio.h>
char c;
char expression[]="The Program is to recognize strings as described by the RE:";
void sayHello();
%}

%%
{char|int}    {
         printf("RE recognized!\n");
         sayHello();
       }
%%

void sayHello()
{
       printf("Hello!\n");
}