lex 使用 lex.yy.c 文件中的 flex -gettin 输出

发布于 2024-12-13 20:51:45 字数 1043 浏览 0 评论 0原文

我写了一个 lex 程序（.l 文件）用于行计数和字符计数程序：

%{
  int charcount=0,linecount=0;
%}
%%
.charcount++
\n linecount++,charcount++;
%%
main()
{
yylex();
printf(“lines  %d”,linecount);
printf(“characters %d”,charcount);
}
int yywrap()
{
return 1;
}

我使用 flex bison 和 codeblocks 写完程序后我使用命令 flex lccc.l 执行它（lccc 是文件名）现在我有 lex.yy.c 文件请告诉我如何获得输出编译 lex.yy.c 是 igivng 和错误..但是这个程序在我大学的 Linux 上运行良好，在家里我在 Windows 上使用上述调整..请帮忙！

这是错误：

 J:\> gcc lex.yy.c
 lccc.l:  In function 'main':
 lccc.l:13: error:  stray'\223' in program
 lccc.l:13: error:  'lines' undeclared (first use in this function )
 lccc.l:13: error:  (Each undeclared identifier is reported only once
 lccc.l:13: error:  for each function it appears in. )
 lccc.l:13: error:  stray'\224' in program
 lccc.l:13: error:  'd' undeclared (first use in this function )
 lccc.l:14: error:  stray'\223' in program
 lccc.l:14: error:  'characters' undeclared (first use in this function )
 lccc.l:14: error:  stray'\224' in program

原文

i have written a lex program ( .l file ) for line count and character count
PROGRAM:

%{
  int charcount=0,linecount=0;
%}
%%
.charcount++
\n linecount++,charcount++;
%%
main()
{
yylex();
printf(“lines  %d”,linecount);
printf(“characters %d”,charcount);
}
int yywrap()
{
return 1;
}

i use flex bison and codeblocks
after writing the program
i executed it with the command flex lccc.l (lccc is the file name)
now i have lex.yy.c file
please tell me how do i get the output
compiling lex.yy.c is igivng and error.. but this program works fine on linux which is at my college, at home i use the above mentioned tweaks on windows.. please help!

this is the error :

 J:\> gcc lex.yy.c
 lccc.l:  In function 'main':
 lccc.l:13: error:  stray'\223' in program
 lccc.l:13: error:  'lines' undeclared (first use in this function )
 lccc.l:13: error:  (Each undeclared identifier is reported only once
 lccc.l:13: error:  for each function it appears in. )
 lccc.l:13: error:  stray'\224' in program
 lccc.l:13: error:  'd' undeclared (first use in this function )
 lccc.l:14: error:  stray'\223' in program
 lccc.l:14: error:  'characters' undeclared (first use in this function )
 lccc.l:14: error:  stray'\224' in program

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云朵有点甜 2024-12-20 20:51:45

您需要将自定义代码括在大括号中。并且后面没有分号： charcount++ and 不能用逗号分隔语句，因此 linecount++, charcount++; 应该是 行数++； charcount++；。

试试这个：

%{
  int charcount=0, linecount=0;
%}
%%
.  {charcount++;}
\n {linecount++; charcount++;}
%%
main()
{
  yylex();
  printf("lines  %d", linecount);
  printf("characters %d", charcount);
}
// ...

You need to enclose custom code in braces. And there's no semi-colon after: charcount++ and you can't separate statements with a comma, so linecount++, charcount++; should be linecount++; charcount++;.

Try this:

%{
  int charcount=0, linecount=0;
%}
%%
.  {charcount++;}
\n {linecount++; charcount++;}
%%
main()
{
  yylex();
  printf("lines  %d", linecount);
  printf("characters %d", charcount);
}
// ...

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