Please help me with code in c$++.$ Please help me to understand the code. Continuing from our Level $3$ Quest we are going to add two pieces of functionality:

The bank occasionally has a prize drawing for a random account holder. You need to write a function that randomly selects an account and displays the winning message.

The ability to save and load the accounts.

Source.cpp

You will add the following functions to your$/$my level $3$ Quest solution:

findAccount: Does the same as Level $3$ Quest.

chooseAccount: asks the user for an account ID$,$ calls findAccount with that ID$,$ and continues to ask until a valid ID is entered. The Account is returned $($NOT THE ID$!)$

prizeDrawing: create a seed, engine, and uniform distribution $($between $0$ and accounts.size$()-1),$ pick a random winner, and display that account holder's first and last name.

loadAccounts: creates a vector of the Account class, and loads it from the passed in file. The file structure is as follows

$1<--$ lastID

$1<--$ number of Accounts

$1$ Joe Smith $1\mathrm{.}23<--$account information $($ID$,$ first, last, beginning balance$)$

$2<--$ number of transactions for this account

$10518$ Walmart $34\mathrm{.}25<--$ date $($month day year$),$ description, and amount for the transaction.

$121518$ Amazon $54\mathrm{.}26<--$another transaction.

NOTE::The file can continue to repeat for additional accounts and additional transactions.

saveAccounts: takes a filename and vector of the Account class and saves it to the save file that was loaded from. Be sure to format the save in such a way that loadAccounts can load it$!$

Account Class

This class takes the place of the account struct and has the following public members$/$methods:

static int lastID; keeps track of the last ID$.$

Account$()$; Should increment lastID, ask the user for the account holder's full name and beginning balance. Use this for new accounts.

Account$($int ID$,$ std::string firstName, std::string lastName, float beginningBalance$)$; Simply assigns the values passed in$.$ Use this for loading from a file.

void addTransaction$()$; copy code from addTransaction function from Level $3$ Quest. Adjust for being in a class. used for new transactions. asks for all information.$---------------------------------------------$ #include

#include

#include

#include

#include

#include "Transaction.h$"$

#include "Account.h$"$

int findAccount$($int ID$,$ const std::vector & accounts$)$;

Account& chooseAccount$($std::vector& accounts$)$;

void prizeDrawing$($const std::vector& accounts$)$;

std::vector loadAccounts$($const std::string & accountFile$)$;

void saveAccounts$($const std::string & accountFile, const std::vector& accounts$)$;

using namespace std;

int main$()$

$\{$

enum class Choices $\{$ addAccount $=1,$ addTransaction, getBalance, print, drawPrize, exit $\}$;

string accountFile$\{$ "accounts.txt$"\}$;

vector accounts$\{$ loadAccounts$($accountFile$)\}$;

int choice$\{0\}$;

while $(($Choices$)$choice $!=$ Choices::exit$)$

$\{$

cout $<<$ "Would you like to:

$"$

$<<"1.$ Add a new Account

$"$

$<<"2.$ Add a new Transaction to an existing Account

$"$

$<<"3.$ Get the current balance of an account

$"$

$<<"4.$ Print Account & Transactions

$"$

$<<"5.$ Draw Prize

$"$

$<<"6.$ Exit

$"$;

cin $>>$ choice;

switch $(($Choices$)$choice$)$

$\{$

case Choices::addAccount:

accounts.push$\_$back$($Account$())$;

break;

case Choices::addTransaction:

chooseAccount$($accounts$).$addTransaction$()$;

break;

case Choices::getBalance:

cout $<<$ "Your current account balance is: $$"<<$ chooseAccount$($accounts$).$getCurrentBalance$()<<$ endl;

break;

case Choices::print:

chooseAccount$($accounts$).$print$()$;

break;

case Choices::drawPrize:

prizeDrawing$($accounts$)$;

break;

default:

break;

$\}$

system$("$PAUSE$")$;

system$("$CLS$")$;

$\}$

saveAccounts$($accountFile$,$ accounts$)$;

$\}$

int findAccount$($int ID$,$ const std::vector& accounts$)$

$\{$

for $($int i$\{0\}$; i $<$ accounts.size$()$; i$++)$

$\{$

if $($accounts$[$i$].$getID$()==$ ID$)$

return i;

$\}$

return $-1$;

$\}$

Account& chooseAccount$($std::vector& accounts$)$

$\{$

while $($true$)$

$\{$

system$("$CLS$")$;

std::cout $<<$ "Which account do you wish to access $(1-"<<$ Account::lastID $<<")$: $"$;

int accountID;

std::cin $>>$ accountID;

if $($int accountIndex$\{$ findAccount$($accountID$,$ accounts$)\}$; accountIndex $!=-1)$

return accounts$[$accountIndex$]$;

else

std::cout $<<$ "not a valid ID$!$

$"$;

$\}$

$\}$