#ifndef PARSER$\_$H

#define PARSER$\_$H

void program$()$;

void statement$()$;

void forStatement$()$;

void ifStatement$()$;

void whileStatement$()$;

void doWhileStatement$()$;

void expression$()$;

void condition$()$;

void match$($int expectedToken$)$;

#endif $//$ PARSER$\_$H

parser.h #include

#include

#include "token.h$"$

#include "parser.h$"$

void program$()\{$

getChar$()$;

lex$()$;

while $($nextToken $!=$ EOF$\_$TOKEN$)\{$

statement$()$;

$\}$

$\}$

void statement$()\{$

switch $($nextToken$)\{$

case FOR$\_$CODE: forStatement$()$; break;

case IF$\_$CODE: ifStatement$()$; break;

case WHILE$\_$CODE: whileStatement$()$; break;

case DO$\_$CODE: doWhileStatement$()$; break;

default: printf$("$Syntax error: invalid statement

$")$; exit$(1)$;

$\}$

$\}$

void forStatement$()\{$

match$($FOR$\_$CODE$)$;

match$($LEFT$\_$PAREN$)$;

expression$()$;

match$($SEMICOLON$)$;

condition$()$;

match$($SEMICOLON$)$;

expression$()$;

match$($RIGHT$\_$PAREN$)$;

match$($LEFT$\_$BRACE$)$;

while $($nextToken $!=$ RIGHT$\_$BRACE$)\{$

statement$()$;

$\}$

match$($RIGHT$\_$BRACE$)$;

$\}$

void ifStatement$()\{$

match$($IF$\_$CODE$)$;

match$($LEFT$\_$PAREN$)$;

condition$()$;

match$($RIGHT$\_$PAREN$)$;

match$($LEFT$\_$BRACE$)$;

while $($nextToken $!=$ RIGHT$\_$BRACE$)\{$

statement$()$;

$\}$

match$($RIGHT$\_$BRACE$)$;

if $($nextToken $==$ ELSE$\_$CODE$)\{$

match$($ELSE$\_$CODE$)$;

match$($LEFT$\_$BRACE$)$;

while $($nextToken $!=$ RIGHT$\_$BRACE$)\{$

statement$()$;

$\}$

match$($RIGHT$\_$BRACE$)$;

$\}$

$\}$

void whileStatement$()\{$

match$($WHILE$\_$CODE$)$;

match$($LEFT$\_$PAREN$)$;

condition$()$;

match$($RIGHT$\_$PAREN$)$;

match$($LEFT$\_$BRACE$)$;

while $($nextToken $!=$ RIGHT$\_$BRACE$)\{$

statement$()$;

$\}$

match$($RIGHT$\_$BRACE$)$;

$\}$

void doWhileStatement$()\{$

match$($DO$\_$CODE$)$;

match$($LEFT$\_$BRACE$)$;

while $($nextToken $!=$ RIGHT$\_$BRACE$)\{$

statement$()$;

$\}$

match$($RIGHT$\_$BRACE$)$;

match$($WHILE$\_$CODE$)$;

match$($LEFT$\_$PAREN$)$;

condition$()$;

match$($RIGHT$\_$PAREN$)$;

match$($SEMICOLON$)$;

$\}$

void expression$()\{$

lex$()$;

$\}$

void condition$()\{$

lex$()$;

$\}$

void match$($int expectedToken$)\{$

if $($nextToken $==$ expectedToken$)\{$

lex$()$;

$\}$ else $\{$

printf$("$Syntax error: expected token $\%$d

$",$ expectedToken$)$;

exit$(1)$;

$\}$

$\}$

int main$()\{$

if $(($in$\_$fp $=$ fopen$("$front$.$in$","$r$"))==$ NULL$)\{$

printf$("$ERROR: cannot open front.in

$")$;

return $1$;

$\}$ else $\{$

program$()$;

printf$("$Parsing completed successfully.

$")$;

fclose$($in$\_$fp$)$;

$\}$

return $0$;

$\}$

$//$ Dummy implementations for getChar and lex

int nextToken;

FILE $*$in$\_$fp;

void getChar$()\{$

$//$ Dummy implementation

$\}$

void lex$()\{$

$//$ Dummy implementation

nextToken $=$ EOF$\_$TOKEN; $//$ Set to EOF$\_$TOKEN for now

$\}$

parser.c

#ifndef TOKEN$\_$H

#define TOKEN$\_$H

#include

$//$ Token definitions

enum $\{$

EOF$\_$TOKEN,

$//$ Add other token definitions here as needed

FOR$\_$CODE, IF$\_$CODE, WHILE$\_$CODE, DO$\_$CODE, ELSE$\_$CODE,

LEFT$\_$PAREN, RIGHT$\_$PAREN, LEFT$\_$BRACE, RIGHT$\_$BRACE,

SEMICOLON

$\}$;

$//$ Global variables

extern int nextToken;

extern FILE $*$in$\_$fp;

$//$ Function prototypes

void getChar$()$;

void lex$()$;

#endif $//$ TOKEN$\_$H

token.h these three codes run correctly but I want tot display the output of the front.in file if everything correct and there no syntax error but in the first must display the parser completed successfully