c++ help: i need help as soon as possible. i have to separate the numbers with c

Question

c++ help:

i need help as soon as possible.

i have to separate the numbers with commas every three

#include <iostream>
#include "CountryList.h"
using namespace std;

//***************************************************************
// Constructor
// - Allocates a sentinel node
// --> an empty data node to be the first node in the list
// - Set the counter to 0
//***************************************************************
CountryList::CountryList()
{
   head = new ListNode;
   head->next = NULL;
   cnt = 0;
}

//**************************************************
// displayList shows the country information
// stored in each node of the linked list
// pointed to by head.
//**************************************************

void CountryList::displayList() const
{
   ListNode *nodePtr;

   nodePtr = head->next;

   //Display the header
   cout << setfill('-');
   cout << setw(6) << "Code";
   cout << setw(20) << "Country";
   cout << setw(20) << "Capital";
   cout << setw(15) << "Population" << endl;
   for (int i = 0; i < 61; i++) { cout << '-'; }

   cout << endl << setfill(' ');
   while (nodePtr) {
       // Display the information in the current node.
       cout << setw(5) <<left<< setprecision(2) << nodePtr->country.code << " ";
       cout << setw(20) <<left << setprecision(2)<< nodePtr->country.name;
       cout << setw(20) <<left << setprecision(2) << nodePtr->country.capital;
       cout << setw(15) << left << setprecision(2) << nodePtr->country.population << endl;
       // Move to the next node.
       nodePtr = nodePtr->next;
   }
   cout << endl;
}

//**************************************************
// The insertNode function inserts a node with
// countryIn copied to its country member.
//**************************************************
void CountryList::insertNode(Country countryIn)
{
   ListNode *newNode; // A new node
   ListNode *nodePtr; // To traverse the list
   ListNode *previousNode = NULL; // The previous node ***** changed by me

                               // Allocate a new node and store the country there.
   newNode = new ListNode;
   newNode->country = countryIn;

   previousNode = head;
   nodePtr = head->next;
   // Find the location of the new node in the sorted list
   while (nodePtr != NULL && strcmp(nodePtr->country.code, countryIn.code) < 0) {
       previousNode = nodePtr;
       nodePtr = nodePtr->next;
   }
   // Update links and counter
   previousNode->next = newNode;
   newNode->next = nodePtr;
   cnt++;
}

//**************************************************
// The deleteNode function searches for a node
// with code as its code. The node, if found, is
// deleted from the list and from memory.
// It returns an error code
// -1 represents an empty list
// 0 means the country was not found
// 1 means the country was deleted
//**************************************************
int CountryList::deleteNode(const char* code)
{
   ListNode *nodePtr; // To traverse the list
   ListNode *previousNode = NULL; // The previous node ***** changed by me

                               // check if list is empty
   if (cnt == 0)
       return -1; // -1 for empty list

   nodePtr = head->next;
   // Search for the node to be deleted from the list
   while (nodePtr != NULL && strcmp(nodePtr->country.code, code) != 0) {
       previousNode = nodePtr;
       nodePtr = nodePtr->next;
   }
   if (nodePtr) { // found
       previousNode->next = nodePtr->next;
       delete nodePtr;
       cnt--; // **** added by me
       return 1; // 1 for success
   }
   return 0; // 0 for not found
}

//**************************************************
// Searches the list for a given country code
// - returns a pointer to the country if found
// - returns NULL if the country cannot be found
//**************************************************
Country* CountryList::findCountry(const char* code) {
   ListNode *nodePtr; // To traverse the list
   ListNode *previousNode = NULL; // The previous node ***** changed by me
                               // If the list is empty, return NULL
   if (cnt == 0)
       return NULL;

   nodePtr = head->next;
   previousNode = head;

   while (nodePtr != NULL && strcmp(nodePtr->country.code, code)) {
       previousNode = nodePtr;
       nodePtr = nodePtr->next;
   }

   if (nodePtr) { // found
       return &nodePtr->country;
   }
   return NULL;
}
//**************************************************
// Destructor
// This function deletes every node in the list.
//**************************************************

CountryList::~CountryList()
{
   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 != NULL) {
       // Save a pointer to the next node.
       nextNode = nodePtr->next;
       // Delete the current node.
       delete nodePtr;
       cnt--; // ****** added by me
                                       // Position nodePtr at the next node.
       nodePtr = nextNode;
   }
}
//**************************************************
// Searches the list for a largest population
// - returns a pointer of the country if found
// - returns null if the country list is empty
//**************************************************
Country* CountryList::findLargest()
{
   ListNode *nodePtr; // To traverse the list

   int LargestPopu = 0;
   ListNode *LargestPopuNode = NULL; // To point to the LargestPopulation Node

                                   // If the list is empty, return NULL
   if (cnt == 0)
       return NULL;
   nodePtr = head->next;
   while (nodePtr != NULL)
   {
       if (nodePtr->country.population > LargestPopu)
       {
           LargestPopu = nodePtr->country.population;
           LargestPopuNode = nodePtr;
       }
       nodePtr = nodePtr->next;
   }
   return &LargestPopuNode->country;
}

Explanation / Answer

Below program would help you do the same
======================================

// The inputted number. Keep this as a string, it's easier to deal with.
std::string     input;

// Get the input line.
std::cout << "Input a number:" << std::endl;
std::cin >> input;

// After every third character, we insert a comma. Go backwards so the leftovers are to the left.
for( int i = input.size() - 3; i > 0; i -= 3 )
{
    input.insert( input.begin() + i, ',' );
}

// Output the number.
std::cout << "The number is: " << input << std::endl;

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