IN C$++$ PLEASE!!!

code for lex.h:

$/*$

$*$ lex.h

$*$

$*$ CS$280$

$*$ Spring $2024$

$*/$

#ifndef LEX$\_$H$\_$

#define LEX$\_$H$\_$

#include

#include

#include

using namespace std;

enum Token $\{$

$//$ keywords OR RESERVED WORDS

IF$,$ ELSE, PRINT, INTEGER, REAL,

CHARACTER, END, THEN, PROGRAM,

LEN,

$//$ identifiers

IDENT,

$//$ an integer, real, logical and string constants

ICONST, RCONST, SCONST, BCONST,

$//$ the arithmetic operators, logic operators, relational operators

PLUS, MINUS, MULT, DIV, ASSOP, EQ$,$ POW,

GTHAN, LTHAN, CAT,

$//$Delimiters

COMMA, LPAREN, RPAREN, DOT, DCOLON, DEF,

$//$ any error returns this token

ERR,

$//$ when completed $($EOF$),$ return this token

DONE,

$\}$;

$//$Class definition of LexItem

class LexItem $\{$

Token token;

string lexeme;

int lnum;

public:

LexItem$()\{$

token $=$ ERR;

lnum $=-1$;

$\}$

LexItem$($Token token, string lexeme, int line$)\{$

this$->$token $=$ token;

this$->$lexeme $=$ lexeme;

this$->$lnum $=$ line;

$\}$

bool operator$==($const Token token$)$ const $\{$ return this$->$token $==$ token; $\}$

bool operator!$=($const Token token$)$ const $\{$ return this$->$token $!=$ token; $\}$

Token GetToken$()$ const $\{$ return token; $\}$

string GetLexeme$()$ const $\{$ return lexeme; $\}$

int GetLinenum$()$ const $\{$ return lnum; $\}$

$\}$;

extern ostream& operatorostream& out, const LexItem& tok$)$;

extern LexItem id$\_$or$\_$kw$($const string& lexeme, int linenum$)$;

extern LexItem getNextToken$($istream& in$,$ int& linenum$)$;

#endif $/*$ LEX$\_$H$\_*/$