我是 flex 和 bison 的新手,我已经在这个项目上工作了几天。我有一个野牛文件,以前蜜蜂工作正常,我对其进行了一些更改,现在它没有创建 tab.h 文件...我已将错误以及我的野牛和 flex 文件放在下面...错误:
In file included from stojk_3_2.y:55:
stojkovic_project1_2.l:4:27: error: stojk_3_2.tab.h: No such file or directory
stojk_3_2.tab.c: In function ‘int yyparse()’:
stojk_3_2.tab.c:1416: warning: deprecated conversion from string constant to ‘char*’
stojk_3_2.tab.c:1562: warning: deprecated conversion from string constant to ‘char*’
.y 文件:
%{
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#define YYSTYPE double
int yylex(void);
static
void yyerror(char *s)
{
printf("yyerror: %s\n", s);
}
%}
%token PLUS
%token MINUS
%token MULT
%token DIVIDE
%token LPAREN
%token RPAREN
%token UNSIGNEDINTEGER
%left PLUS MINUS
%left MULT DIVIDE
%token Variable
%token Exp
%token Sign
%token Unsigned_int
%token Unsigned_float_int
%token Factor
%%
lines : lines expr '\n' {printf("%g\n", $2);}
| lines '\n'
| /*empty*/
;
expr : expr PLUS expr {$$ = $1 + $3;}
| expr MINUS expr {$$ = $1 - $3;}
| expr MULT expr {$$ = $1 * $3;}
| expr DIVIDE expr {$$ = $1 / $3;}
| LPAREN expr RPAREN {$$ = $2;}
| UNSIGNEDINTEGER
;
%%
#include "lex.yy.c"
int yylex(void);
int yyparse(void);
int main(void)
{
return yyparse();
}
.l 文件
/*** Definition section ***/
%{
#include "stojk_3_2.tab.h"
%}
Variable [a-zA-Z_]+[a-zA-Z0-9_]*
Digit [0-9]
Digits [0-9]*
Sign [+]|[-]
Exp [E]+{Sign}|[e]+{Sign}
Unsigned_int {Digit}|{Digits}
Unsigned_float_int ({Digit}|{Digits}+[.]+{Digit}|{Digits})({Digit}| {Digits}+[.]+{Digit}|{Digits}+{Exp}+{Digit}|{Digits})
Factor {Variable}|{Unsigned_int}| {Unsigned_float_int}
%{
/* C code to be copied verbatim */
#include <stdio.h>
%}
/* This tells flex to read only one input file */
%option noyywrap
%%
/*** Rules section ***/
/* [0-9]+ matches a string of one or more digits */
{Variable} { return Variable; }
{Exp} {return Exp; }
{Sign} { return Sign; }
{Unsigned_int} { return Unsigned_int; }
{Unsigned_float_int} { return Unsigned_float_int; }
{Factor} { return Factor; }
.|\n { /* Ignore all other characters. */ }
%%