Q:

C++ - Linked List not generating any output

I am trying a print a linked list. The program is as follows:
#include<iostream>
#include<vector>
using namespace std;
class Link
{
    public:
        int iData;
        double dData;
        Link* pNext;
        Link(int id,double dd)
        {
            iData = id;
            dData = dd;
        }
        void displayLink()
        {
            cout<<"iData = "<<iData<<"\n";
            cout<<"dData = "<<dData<<"\n";
        }
};
class OrderedList
{
    private:
        Link* pRoot;
    public:
        OrderedList()
        {
            pRoot = NULL;
        }
        void insert(int id,double dd)
        {
            Link* newlink = new Link(id,dd);
            Link* pCurrent = pRoot;
            Link* pPrev = pRoot;
            while(pCurrent!=NULL&&pCurrent->iData<=id)
            {
                pPrev = pCurrent;
                pCurrent = pCurrent->pNext;
            }
                newlink->pNext = pCurrent;
            if(pCurrent==NULL)
            {
                pCurrent = newlink;
            }
            else
            {
                pPrev->pNext = newlink;
            }
        }
        Link* search(int val)
        {
            Link* pCurrent = pRoot;
            while(pCurrent!=NULL&&pCurrent->iData<val)
            {
                pCurrent = pCurrent->pNext;
            }
            return pCurrent;
        }
        bool remove(int val)
        {
            Link* pCurrent = pRoot;
            Link* pPrev = pRoot;
            while(pCurrent!=NULL&&pCurrent->iData<val)
            {
                pPrev = pCurrent;
                pCurrent = pCurrent->pNext;
            }
            if(pCurrent==NULL)
                return false;
            else
            {
                Link* temp = pCurrent;
                pPrev->pNext = pCurrent->pNext;
                delete temp;
                return true;
            }
        }
        void displayList()
        {
            Link* pCurrent = pRoot;
            while(pCurrent!=NULL)
            {
                pCurrent->displayLink();
                pCurrent = pCurrent->pNext;
            }
        }
};
OrderedList ol;
    ol.insert(10,10.10);
    ol.insert(11,11.11);
    ol.insert(12,12.12);
    ol.insert(13,13.13);
    ol.insert(14,14.14);
    ol.insert(15,15.15);
    ol.insert(16,16.16);
    ol.insert(17,17.17);
    ol.insert(18,18.18);
    ol.insert(19,19.19);
    ol.insert(20,20.20);
    ol.insert(21,21.21);
    ol.insert(22,22.22);
    ol.insert(23,23.23);
    ol.insert(24,24.24);
    ol.insert(25,25.25);
    ol.insert(26,26.26);
    ol.insert(27,27.27);
    ol.insert(28,28.28);
    ol.insert(29,29.29);
    ol.displayList();

The problem that I am facing is that the code is looking correct and in running fine on paper. When I try to run it on computer, it compiles without any error. However, on executing it, no output is shown. Not even any error. The program just executes without displaying anything. I am not able pin point the problem. I think that the code is fine. Please help me with this problem.

A:

OrderedList never sets pRoot to anything, other than setting it to NULL in the constructor. Therefore insert() doesn't do anything (other than create a Link and leak it), and the call to displayList() never enters the while loop. delete() does no work either, since it always sees an empty list.

