I'm having trouble displaying a linked list - c++

Question

When I run my program, it works as intended, except the items in the list have no spaces between them when the displayList() function is called. I have 3 files. The main cpp file is ShoppingList.cpp. Then I have two other files for the linked list classification and implementation.
//ShoppingList.cpp
//Michael Hery
//COP 2001
//11/9/17
//Shopping List
#include <iostream>
#include <string>
#include "strList.h"
#include "strlist.cpp"
using namespace std;
int main()
{
//Define a NumberList object
StrList list;
string item;
string delItem;
int menuSelection;
//Ask the user how many items to
//put in the list
cout << "How many items would you like to put it the list? >> ";
cin >> menuSelection;
while (menuSelection < 1)
{
cout << "Please enter a valid number (greater than 0) >> ";
cin >> menuSelection;
}
for (int i = 0; i < menuSelection; i++)
{
cout << "Please enter item " << i + 1 << ": ";
cin >> item;
list.appendNode(item);
}
list.displayList();
cout << "Which item do you wish to delete from the list? >> ";
cin >> delItem;
while (delItem == "")
{
cout << "Please enter a valid item >> ";
cin >> delItem;
}
list.deleteNode(delItem);
list.displayList();
//Wait for user input to exit program
system("PAUSE");
return 0;
}
//strList.h
#ifndef STRLIST_H
#define STRLIST_H
#include <iostream>
#include <string>
namespace
{
class StrList
{
private:
struct ListNode
{
std::string value;
struct ListNode *next;
};
ListNode *head;
public:
//Constructor
StrList()
{
head = nullptr;
}
//Destructor
~StrList();
//Linked List Operations
void appendNode(std::string item);
void insertNode(std::string item);
void deleteNode(std::string item);
void displayList() const;
};
}
#endif
//strList.cpp
#ifndef STRLIST_CPP
#define STRLIST_CPP
#include <iostream>
#include <string>
#include "strList.h"
void StrList::appendNode(std::string item)
{
ListNode *newNode;
ListNode *nodePtr;
//Allocate a new node and store item there
newNode = new ListNode;
newNode->value = item;
newNode->next = nullptr;
//If there are no nodes in the list
//make newNode the first node
if (!head)
head = newNode;
else //Otherwise, insert newNode at the end
{
//Initialize nodePtr to head of the list
nodePtr = head;
//Find the last node in the list
while (nodePtr->next)
nodePtr = nodePtr->next;
//Insert newNode as the last node
nodePtr->next = newNode;
}
}
void StrList::insertNode(std::string item)
{
ListNode *newNode;
ListNode *nodePtr;
ListNode *previousNode = nullptr;
//Allocate a new node and store num there
newNode = new ListNode;
newNode->value = item;
//If there are no nodes in the list
//make newNode the first node
if (!head)
{
head = newNode;
newNode->next = nullptr;
}
else //Otherwise, insert newNode
{
//Position nodePtr at the head of list
nodePtr = head;
//Initialize previousNode to nullPtr
previousNode = nullptr;
//Skip all nodes whose values is less than num
while (nodePtr != nullptr && nodePtr->value < item)
{
previousNode = nodePtr;
nodePtr = nodePtr->next;
}
//If the new node is to be the 1st in the list,
//insert it before all the other nodes
if (previousNode == nullptr)
{
head = newNode;
newNode->next = nodePtr;
}
else //Otherwise insert after the previous node
{
previousNode->next = newNode;
newNode->next = nodePtr;
}
}
}
void StrList::deleteNode(std::string item)
{
ListNode *nodePtr; //To traverse the list
ListNode *previousNode = nullptr; //To point to the previous node
//If the list is empty, do nothing
if (!head)
return;
//Determine if the first node is the one
if (head->value == item)
{
nodePtr = head->next;
delete head;
head = nodePtr;
}
else
{
//Initialize nodePtr to head of list
nodePtr = head;
//Skip all nodes whose value member is
//not equal to num
while (nodePtr != nullptr && nodePtr->value != item)
{
previousNode = nodePtr;
nodePtr = nodePtr->next;
}
//If nodePtr is not at the end of the list,
//link the previous node to the node after
//nodePtr, then delete nodePtr
if (nodePtr)
{
previousNode->next = nodePtr->next;
delete nodePtr;
}
}
}
StrList::~StrList()
{
ListNode *nodePtr; //To traverse the list
ListNode *nextNode; //To point to the next node
//Position nodePtr at the head of the list
nodePtr = head;
//While nodePtr is not at the end of the list
while (nodePtr != nullptr)
{
//Save a pointer to the next node
nextNode = nodePtr->next;
//Delete the current node
delete nodePtr;
//Position nodePtr at the next node
nodePtr = nextNode;
}
}
void StrList::displayList() const
{
ListNode *display;
display = head;
std::cout << "**********************************" << std::endl;
std::cout << "**** Your Shopping List ****" << std::endl;
std::cout << "**********************************" << std::endl;
while (display)
{
std::cout << display->value;
display = display->next;
}
}
#endif
The problem lies in the displayList(); function towards the end of the file.

Answer 1

Add a separator for between your values.
char const* sep = "";
while (display)
{
std::cout << sep << display->value;
sep = " ";
display = display->next;
}