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Posted 22 July 2009 - 06:42 AM
lex
%{
#include <string.h>
#include <stdio.h>
#include "y.tab.h"
#define N 9
%}
%%
[1-9][0-9]* {
printf("%s",yytext);
strcpy(yylval.ystr,yytext);
return (DEC_CONST);
}
"*" {
printf("%s",yytext);
strcpy(yylval.ystr,yytext);
return ('*');
}
"/" {
printf("%s",yytext);
strcpy(yylval.ystr,yytext);
return ('/');
}
"%" {
printf("%s",yytext);
strcpy(yylval.ystr,yytext);
return ('%');
}
"+" {
printf("%s",yytext);
strcpy(yylval.ystr,yytext);
return ('+');
}
"-" {
printf("%s",yytext);
strcpy(yylval.ystr,yytext);
return ('-');
}
"=" {
printf("%s",yytext);
strcpy(yylval.ystr,yytext);
return ('=');
}
"(" {
printf("%s",yytext);
strcpy(yylval.ystr,yytext);
return ('(');
}
")" {
printf("%s",yytext);
strcpy(yylval.ystr,yytext);
return (')');
}
[a-zA-Z]([a-zA-Z]|[0-9])* {
int i;
printf("%s",yytext);
i=id_or_keyword(yytext);
if(i==ID)
strcpy(yylval.ystr,yytext);
else
yylval.yint=i;
return (i);
}
[ \f\n\r\t]+ printf("%s",yytext);
. {
printf("Agnwstos xaraktiras %s\n",yytext);
}
%%
static char *kid[N]={"and","else","if","int","not","or","print","read","while"};
static int kval[N]={AND,ELSE,IF,INT,NOT,OR,PRINT,READ,WHILE};
int id_or_keyword(char *s){
int i;
for(i=0; (i<N) && (strcmp(s,kid[i]) != 0);i++);
if(i<N)
return kval[i];
else
return ID;
}
yacc
%{
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
%}
%union
{
int yint;
char ystr[81];
int nonterm;
}
%token <yint> AND ELSE IF INT NOT OR PRINT READ WHILE
%token <ystr> DEC_CONST
%token <ystr> '(' ')'
%token <ystr> '*' '/' '%' '+' '-' '='
%token <ystr> ID
%type <nonterm> PrimExpr Literal ParenExpr PrefixExpr MultExpr
%type <nonterm> AddExpr Expr
%start Expr
%%
PrimExpr : Literal
{
$$=$1;
}
;
Literal : DEC_CONST
{
$$=atoi($1);
}
;
ParenExpr : PrimExpr
{
$$=$1;
}
| '(' Expr ')'
{
$$=$2;
}
;
PrefixExpr : ParenExpr
{
$$=$1;
}
;
MultExpr : PrefixExpr
{
$$=$1;
}
| MultExpr '*' PrefixExpr
{
$$=$1*$3;
}
| MultExpr '/' PrefixExpr
{
$$=$1/$3;
}
| MultExpr '%' PrefixExpr
{
$$=$1%$3;
}
;
AddExpr : MultExpr
{
$$=$1;
}
| AddExpr '+' MultExpr
{
$$=$1+$3;
}
| AddExpr '=' MultExpr
{
$$=$1-$3;
}
;
Expr : AddExpr
{
$$=$1;
printf("To apotelesma einai:%d\n",$1);
}
;
%%
void yyerror(char *s)
{
fputs(s,stderr); putc('\n',stderr);
}
main(void)
{
yyparse();
}
I just want to show me why i have this error:
syd:90: warning: conflicting types for 'yyerror'
y.tab.c:1475: warning: previous implicit declaration of 'yyerror' was here
Undefined symbols:
"_yywrap", referenced from:
_yylex in ccy3LNwv.o
_input in ccy3LNwv.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
Thanks in advance.
MultiQuote
| 