hallo,
i have a problem, the followed program gives back an error, error:: Undeclared(first use in function), why this error appears all tokens are declared, but this error comes, can anyone help me, here are the lex and yac files.thanks
lex:
%{
int yylinenu= 1;
int yycolno= 1;
%}
%x STR
DIGIT [0-9]
ALPHA [a-zA-Z]
ID {ALPHA}(_?({ALPHA}|{DIGIT}))*_?
GROUPED_NUMBER ({DIGIT}{1,3})(\.{DIGIT}{3})*
SIMPLE_NUMBER {DIGIT}+
NUMMER {GROUPED_NUMBER}|{SIMPLE_NUMBER}
%%
<INITIAL>{
[\n] {++yylinenu ; yycolno=1;}
[ ]+ {yycolno=yycolno+yyleng;}
[\t]+ {yycolno=yycolno+(yyleng*8);}
"*" {return MAL;}
"+" {return PLUS;}
"-" {return MINUS;}
"/" {return SLASH;}
"(" {return LINKEKLAMMER;}
")" {return RECHTEKLAMMER;}
"{" {return LINKEGESCHWEIFTEKLAMMER;}
"}" {return RECHTEGESCHEIFTEKLAMMER;}
"=" {return GLEICH;}
"==" {return GLEICHVERGLEICH;}
"!=" {return UNGLEICH;}
"<" {return KLEINER;}
">" {return GROSSER;}
"<=" {return KLEINERGLEICH;}
">=" {return GROSSERGLEICH;}
"while" {return WHILE;}
"if" {return IF;}
"else" {return ELSE;}
"printf" {return PRINTF;}
";" {return SEMIKOLON;}
\/\/[^\n]* { ;}
{NUMMER} {return NUMBER;}
{ID} {return IDENTIFIER;}
\" {BEGIN(STR);}
. {;}
}
<STR>{
\n {++yylinenu ;yycolno=1;}
([^\"\\]|"\\t"|"\\n"|"\\r"|"\\b"|"\\\"")+ {return STRING;}
\" {BEGIN(INITIAL);}
}
%%
yywrap()
{
}
YACC:
%{
#include stdio.h>
#include string.h>
#include "lex.yy.c"
void yyerror(char *err);
int error=0,linecnt=1;
%}
%token IDENTIFIER NUMBER STRING COMMENT PLUS MINUS MAL SLASH LINKEKLAMMER RECHTEKLAMMER LINKEGESCHWEIFTEKLAMMER RECHTEGESCHEIFTEKLAMMER GLEICH GLEICHVERGLEICH UNGLEICH GROSSER KLEINER GROSSERGLEICH KLEINERGLEICH IF ELSE WHILE PRINTF SEMIKOLON
%start Stmts
%%
Stmts : Stmt
{puts("\t\tStmts : Stmt");}
|Stmt Stmts
{puts("\t\tStmts : Stmt Stmts");}
; //NEUE REGEL----------------------------------------------
Stmt : LINKEGESCHWEIFTEKLAMMER Stmts RECHTEGESCHEIFTEKLAMMER
{puts("\t\tStmt : '{' Stmts '}'");}
|IF LINKEKLAMMER Cond RECHTEKLAMMER Stmt
{puts("\t\tStmt : '(' Cond ')' Stmt");}
|IF LINKEKLAMMER Cond RECHTEKLAMMER Stmt ELSE Stmt
{puts("\t\tStmt : '(' Cond ')' Stmt 'ELSE' Stmt");}
|WHILE LINKEKLAMMER Cond RECHTEKLAMMER Stmt
{puts("\t\tStmt : 'PRINTF' Expr ';'");}
|PRINTF Expr SEMIKOLON
{puts("\t\tStmt : 'PRINTF' Expr ';'");}
|IDENTIFIER GLEICH Expr SEMIKOLON
{puts("\t\tStmt : 'IDENTIFIER' '=' Expr ';'");}
|SEMIKOLON
{puts("\t\tStmt : ';'");}
;//NEUE REGEL ---------------------------------------------
Cond: Expr GLEICHVERGLEICH Expr
{puts("\t\tCond : '==' Expr");}
|Expr UNGLEICH Expr
{puts("\t\tCond : '!=' Expr");}
|Expr KLEINER Expr
{puts("\t\tCond : '<' Expr");}
|Expr KLEINERGLEICH Expr
{puts("\t\tCond : '<=' Expr");}
|Expr GROSSER Expr
{puts("\t\tCond : '>' Expr");}
|Expr GROSSERGLEICH Expr
{puts("\t\tCond : '>=' Expr");}
;//NEUE REGEL --------------------------------------------
Expr:Term
{puts("\t\tExpr : Term");}
|Term PLUS Expr
{puts("\t\tExpr : Term '+' Expr");}
|Term MINUS Expr
{puts("\t\tExpr : Term '-' Expr");}
;//NEUE REGEL --------------------------------------------
Term:Factor
{puts("\t\tTerm : Factor");}
|Factor MAL Term
{puts("\t\tTerm : Factor '*' Term");}
|Factor SLASH Term
{puts("\t\tTerm : Factor '/' Term");}
;//NEUE REGEL --------------------------------------------
Factor:SimpleExpr
{puts("\t\tFactor : SimpleExpr");}
|MINUS SimpleExpr
{puts("\t\tFactor : '-' SimpleExpr");}
;//NEUE REGEL --------------------------------------------
SimpleExpr:LINKEKLAMMER Expr RECHTEKLAMMER
{puts("\t\tSimpleExpr : '(' Expr ')'");}
|IDENTIFIER
{puts("\t\tSimpleExpr : 'IDENTIFIER'");}
|NUMBER
{puts("\t\tSimpleExpr : 'NUMBER'");}
|STRING
{puts("\t\tSimpleExpr : 'String'");}
;//ENDE -------------------------------------------------
%%
void yyerror(char *msg)
{
error=1;
printf("Line: %d , Column: %d : %s \n", yylinenu, yycolno,yytext, msg);
}
int main(int argc, char *argv[])
{
int val;
while(yylex())
{
printf("\n",yytext);
}
return yyparse();
}
