Re: Hi everyone,

I've missed to remove some code from the lexer.l file:

%{

#include <stdio.h>

#include <stdlib.h>

#include "./parser.tab.h"

enum yytokentype {

     NUMBER = 285,

     VAL = 292,

     ADD = 286,

     SUB = 287,

     MUL = 288,

     DIV = 289,

     ABS = 290,

     EOL    = 291

};

int yylval;

char *value = NULL;

%}

%%

"+"            { return ADD; }

"-"            { return SUB; }

"*"            { return MUL; }

"/"            { return DIV; }

"|"            { return ABS; }

[0-9]+        { yylval = atoi(yytext); return NUMBER; }

\n            { return EOL; }

[ \t]        { /* ignore whitespaces */ }

[a-zA-Z]    { printf("Unknow string :%s", yytext); }

.            { printf("Unknow char :%c", *yytext); }

%%

On 17.02.19 11:49, [email protected] wrote:
> i'm new to Flex and Bison and are currently reading the book "Flex and 
> Bison" and have a few troubles understanding things correctly.
>
>
> First of all i've troubles compiling the first example that uses both, 
> Flex and Bison. Flex compilation was easy but with Biton i've 
> troubles, first the example source from the book:
>
>
> *lexer.l:*
>
> %{
>
> #include <stdio.h>
>
> #include <stdlib.h>
>
> #include "./parser.tab.h"
>
> enum yytokentype {
>
>     NUMBER = 285,
>
>     VAL = 292,
>
>     ADD = 286,
>
>     SUB = 287,
>
>     MUL = 288,
>
>     DIV = 289,
>
>     ABS = 290,
>
>     EOL    = 291
>
> };
>
> int yylval;
>
> char *value = NULL;
>
> %}
>
> %%
>
> "+"            { return ADD; }
>
> "-"            { return SUB; }
>
> "*"            { return MUL; }
>
> "/"            { return DIV; }
>
> "|"            { return ABS; }
>
> [0-9]+        { yylval = atoi(yytext); return NUMBER; }
>
> \n            { return EOL; }
>
> [ \t]        { /* ignore whitespaces */ }
>
> [a-zA-Z]    { printf("Unknow string :%s", yytext); }
>
> .            { printf("Unknow char :%c", *yytext); }
>
> %%
>
> int main(int argc, char **argv){
>
>     int tok;
>
>     while(tok = yylex()){
>
>         printf("token = %d", tok);
>
>         if(tok == NUMBER){
>
>             printf(" = %d", yylval);
>
>         }else{
>
>             printf("\n");
>
>         }
>
>     }
>
>     return(0);
>
> }
>
>
> *parser.y:*
>
> %{
>
> #include <stdio.h>
>
> #include <stdlib.h>
>
> %}
>
> %token NUMBER
>
> %token ADD SUB MUL DIV ABS
>
> %token EOL
>
> %%
>
> calclist: /* nothing */
>
>     | calclist exp EOL { printf(" = %d\n", $2); }
>
>     ;
>
> exp: factor
>
>     | exp ADD factor { $$ = $1 + $3; }
>
>     | exp SUB factor { $$ = $1 - $3; }
>
>     ;
>
> factor: term
>
>     | factor MUL term { $$ = $1 * $3; }
>
>     | factor DIV term { $$ = $1 / $3; }
>
>     ;
>
> term: NUMBER
>
>     | ABS term { $$ = $2 >=0? $2 : - $2; }
>
>     ;
>
> %%
>
> int main(int argc, char **argv){
>
>     yyparse();
>
>     return(0);
>
> }
>
> yyerror(char *s){
>
>     fprintf(stderr, "error: %s\n", s);
>
> }
>
> *And here is my 'MakeFile:*
>
> test: lexer.l parser.tab.c parser.tab.c
>     gcc parser.tabs.c lex.yy.c -lfl -o test
>
> parser.tab.c: parser.tab.c paser.tab.c
>     bison -d parser.y
>
> lexer.l: lex.yy.c
>     flex lexer.l
>
> clean:
>     rm -rf lex.yy.c test1.tab.* test
>
> I can't get i compile and if i get i compile by hand i get errors ... 
> please can someone help me out here,
> the book doens't go to much into detail about this topic.
>
> best reagards!
>
> _______________________________________________
> [email protected] https://lists.gnu.org/mailman/listinfo/help-bison

_______________________________________________
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