For the following problem, please explain what lastNode$->$InsertAfter$($currNode$)$ is doing. I am really confused by the arrow. Also, explain what lastNode $=$ currNode is doing. Those are the most important things for me Please use C$++.$

Given the MileageTrackerNode class, complete main$()$ to insert nodes into a linked list $($using the InsertAfter$()$ function$).$ The first user$-$input value is the number of nodes in the linked list. Use the PrintNodeData$()$ function to print the entire linked list. DO NOT print the dummy head node.

Ex$.$ If the input is:

$3$

$2\mathrm{.}2$

$7/2/18$

$3\mathrm{.}2$

$7/7/18$

$4\mathrm{.}5$

$7/16/18$

the output is: $($Results need to output exactly like below no extra zeros please$)$

$2\mathrm{.}2,7/2/18$

$3\mathrm{.}2,7/7/18$

$4\mathrm{.}5,7/16/18$

main.cpp

#include "MileageTrackerNode.h$"$

#include

#include

using namespace std;

int main $()\{$

$//$ References for MileageTrackerNode objects

MileageTrackerNode$*$ headNode;

MileageTrackerNode$*$ currNode;

MileageTrackerNode$*$ lastNode;

double miles;

string date;

int i;

$//$ Front of nodes list

headNode $=$ new MileageTrackerNode$()$;

lastNode $=$ headNode;

$//$ TODO: Read in the number of nodes

$//$ TODO: For the read in number of nodes, read

$//$ in data and insert into the linked list

$//$ TODO: Call the PrintNodeData$()$ method

$//$ to print the entire linked list

$//$ MileageTrackerNode Destructor deletes all

$//$ following nodes

delete headNode;

$\}$

MileageTrackerNode.h

#ifndef MILEAGETRACKERNODEH

#define MILEAGETRACKERNODEH

#include

using namespace std;

class MileageTrackerNode $\{$

public:

$//$ Constructor

MileageTrackerNode$()$;

$//$ Destructor

~MileageTrackerNode$()$;

$//$ Constructor

MileageTrackerNode$($double milesInit, string dateInit$)$;

$//$ Constructor

MileageTrackerNode$($double milesInit, string dateInit, MileageTrackerNode$*$ nextLoc$)$;

$/*$ Insert node after this node.

Before: this $--$ next

After: this $--$ node $--$ next

$*/$

void InsertAfter$($MileageTrackerNode$*$ nodeLoc$)$;

$//$ Get location pointed by nextNodeRef

MileageTrackerNode$*$ GetNext$()$;

void PrintNodeData$()$;

private:

double miles; $//$ Node data

string date; $//$ Node data

MileageTrackerNode$*$ nextNodeRef; $//$ Reference to the next node

$\}$;

#endif

MileageTrackerNode.cpp

#include "MileageTrackerNode.h$"$

#include

$//$ Constructor

MileageTrackerNode::MileageTrackerNode$()\{$

miles $=0\mathrm{.}0$;

date $=""$;

nextNodeRef $=$ nullptr;

$\}$

$//$ Destructor

MileageTrackerNode::~MileageTrackerNode$()\{$

if$($nextNodeRef $!=$ nullptr$)\{$

delete nextNodeRef;

$\}$

$\}$

$//$ Constructor

MileageTrackerNode::MileageTrackerNode$($double milesInit, string dateInit$)\{$

miles $=$ milesInit;

date $=$ dateInit;

nextNodeRef $=$ nullptr;

$\}$

$//$ Constructor

MileageTrackerNode::MileageTrackerNode$($double milesInit, string dateInit, MileageTrackerNode$*$ nextLoc$)\{$

miles $=$ milesInit;

date $=$ dateInit;

nextNodeRef $=$ nextLoc;

$\}$

$/*$ Insert node after this node.

Before: this $--$ next

After: this $--$ node $--$ next

$*/$

void MileageTrackerNode::InsertAfter$($MileageTrackerNode$*$ nodeLoc$)\{$

MileageTrackerNode$*$ tmpNext;

tmpNext $=$ nextNodeRef;

nextNodeRef $=$ nodeLoc;

nodeLoc$->$nextNodeRef $=$ tmpNext;

$\}$

$//$ Get location pointed by nextNodeRef

MileageTrackerNode$*$ MileageTrackerNode::GetNext$()\{$

return nextNodeRef;

$\}$

void MileageTrackerNode::PrintNodeData$()\{$

cout $<<$ miles $<<","<<$ date $<<$ endl;

$\}$