I need help to separate this code by classes, article class and user class

#include

I need help separating this code by classes, item class and user class.

#include

#include

#include

#include "user.h$"$

#include "article.h$"$

using the standard namespace;

int main$()\{$

fstream file;

string user, pass;

string fuser, fpass;

vectorcart;

inner band $=0$;

file.open$("$user$.$txt$")$;

if $(!$file.is$\_$open$())\{$

cout $<<$ "Error opening file" $<<$ endl;

return $1$;

$\}$

cout $<<$ "User: $"$;

cin $>>$ user;

cout $<<$ "Password: $"$;

cin $>>$ pass;

while $(!$file.eof$())\{$

file $>>$ fuser $>>$ fpass;

if $($fuser $==$ user && fpass $==$ pass$)\{$

band $=1$;

break;

$\}$

$\}$

file.close$()$;

if $($band $==1)\{$

item obj$1("$Paper$",50)$;

item obj$2("$Feather$",20)$;

item obj$3("$Laptop$",100)$;

item obj$4("$Pencil$",10)$;

item obj$5("$Draft$",5)$;

vector items $=\{$obj$1,$ obj$2,$ obj$3,$ obj$4,$ obj$5\}$;

internal choice;

do$\{$

cout $<<"---$ Welcome to my online store $---"<>$ election;

change $($choice$)\{$

Case $1$:$\{$

int subselection;

cout $<<$ "How would you like to consult the articles?

$"$;

cout $<<"1.$ Prices below a certain quantity.

$"$;

cout $<<"2.$ Prices above a certain quantity

$"$;

cout $<<"3.$ Name

$"$;

cout $<<$ "Enter your choice: $"$;

cin $>>$ subselection;

int pricelimit;

string itemName;

change$($suboption$)\{$

Case $1$:

case $2$:

cout $<<$ "Enter price limit: $"$;

cin $>>$ price limit;

break;

case $3$:

cout $<<$ "Enter the element name: $"$;

cin $>>$ itemname;

break;

$\}$

cout $<<$ "Available elements:

$"$;

for $($int i $=0$; i $<$ items.size$()$; i$++)\{$

bool display $=$ false;

if $($subchoice $==1$ && items$[$i$].$getPrice$()$ priceLimit$)$ display $=$ true;

if $($subchoice $==3$ && items$[$i$].$getName$()==$ item name$)$ display $=$ true;

if $($show$)\{$

cout $<<$ i $+1<<"."<<$ items$[$i$].$getName$()<<"-$ Price: $$"<<$ items$[$i$].$getPrice$()<<$ endl;

$\}$

$\}$

charad;

cout $<<"$Do you want to add an item to your cart? $($Y$/$N$)$: $"$;

cin $>>$ add;

if $($add $==\text{'}$Y$\text{'})\{$

int itemNumber, quantity;

cout $<<$ "Enter item number: $"$;

cin $>>$ item number;

cout $<<$ "How many pieces?";

cin $>>$ quantity;

items$[$itemNum $-1].$setQuantity$($quantity$)$;

cart.push$\_$back$($items$[$itemNum $-1])$;

cout $<<$ "Item added to cart.

$"$;

$\}$

continuous chain;

cout $<<"$Do you want to exit to the main menu or continue adding items? $($Menu$/$Add$)$: $"$;

cin $>>$ cont;

while $($cont $==$ "Add"$)\{$

int itemNumber, quantity;

cout $<<$ "Enter item number: $"$;

cin $>>$ item number;

cout $<<$ "How many pieces?";

cin $>>$ quantity;

items$[$itemNum $-1].$setQuantity$($quantity$)$;

cart.push$\_$back$($items$[$itemNum $-1])$;

cout $<<$ "Item added to cart.

$"$;

cout $<<"$Do you want to exit to the main menu or continue adding items? $($Menu$/$Add$)$: $"$;

cin $>>$ cont;

$\}$

break;

$\}$

case $2$:$\{$

cout $<<$ "Your cart:

$"$;

total integer $=0$;

for $($int i $=0$; i $<$ cart.size$()$; i$++)\{$

cout $<<$ i $+1<<"."<<$ cart$[$i$].$getName$()<<"-$ Price: $$"<<$ cart$[$i$].$getPrice$()<<"-$ Quantity: $"<<$ cart$[$ i$].$getQuantity$()<<$ endl;

total $+=$ cart$[$i$].$getPrice$()*$ cart$[$i$].$getQuantity$()$;

$\}$

cout $<<$ "Total to pay: $$"<<$ total $<<$ endl;

string buyOrCont;

cout $<<"$Do you want to finish or continue shopping? $($Finish$/$Buy$)$: $"$;

cin $>>$ buyOrCont;

if $($buyOrCont $==$ "Finish"$)\{$

cout $<<$ "Press Ok to close the sale..

$"$;

string Ok;

cin $>>$ Ok;

if $($Okay $==$ "Okay"$)\{$

cout $<<$ "Sale successfully closed. Thank you for shopping with us$!$

$"$;

cart.clear$()$;

$\}$

$\}$

break;

$\}$

case $3$:

cout $<<$ "Leaving...

$"$;

break;

default:

cout $<<$ "Invalid choice. Please enter again.

$"$;

break;

$\}$

$\}$

while $($choice $!=3)$;$\}$

the rest$\{$

cout $<<$ "Invalid username or password. Please try again.

$"$;

$\}$

return $0$;

$\}$