Hi Everyone,

I am studying/writing/ code for a future Advanced Data Structure class in C++; however I am not suppose to use STL, Templates and etc (the way I just code "kinda" of resembles what I have to use).

My application is suppose to read/analyze all integers contained in a text file of 5-digit integers (10000 99999).

For simplicity I am using the following input (or please, check the attached):

20007 20008 20009
20010 20010
20012 20012
20013
20014 20010
20015
20016

10000 10009 10009 10003
10004 10005
10006 10002
10008 10003
10007
10013

20151 20151
20152

30734
30735
30736
30736 30738
30738
30739
30740
30741
30742
30743 30744 30745 30746 30747

30748

So far, my code is not displaying/printing the lists separated by the first digit of these 5-digits integers. I am expecting it to display/print logically/similar to the following:

Output:

Results for input file numbers.txt:
27 total integers read from file

The 3 unique integers beginning with digit 1 were
18399 17342 19948

The 6 unique integers beginning with digit 3 were
39485 34710 31298 38221 35893 32791

The 4 unique integers beginning with digit 4 were
43928 49238 45678 43210

The 6 unique integers beginning with digit 6 were
64545 62987 66221 61777 66666 65432

The 2 unique integers beginning with digit 8 were
88888 86861

The 1 unique integer beginning with digit 9 was
98765

There were 22 unique 5-digit integers in the file.
The highest unique count in one list was 6 integers.


My code that will follow soon displays/prints only the LAST 5-digits "group" of integers (in this case the 5-digits starting with 3). I am not sure what's wrong with my code; perhaps I am not designing it correctly. May be my calls in it are on the wrong place or I have to write all integers and then traverse it and output it (if that's the case, I am not sure how).

Please, any directions, any ideas will be greatly appreciated.

My code follows:
**********************************************
Code:
#include <iostream> 
#include <fstream>
#include <iomanip>

using namespace std;  

const int MAX_CELLS = 10;        
const int UNIQUE_FIVE_DIGIT = 5; 

struct node
{
    node* prev;                                            
    node* next;                                        
    int   data;                                        
};           
/////////////////////////////////////////////////////////////////////
int main(int argc, char* argv[]) 
{
    ifstream inFile;                      
    node *lists[MAX_CELLS] = { NULL };      
    int count = -1;                       
    bool result = true;                     

    do 
    {

        if ( argc != 2 ) 
        {
            cout << "Command line arguments not valid!" << endl << endl;
            result = false;
        }   

        if ( !argv[1] ) 
        {
            cout << "The command line arguments does not specify any filename!" << endl; 
            result = false;
        }           

        inFile.open(argv[1]);

        if ( !inFile ) 
        {
            cout << "The input data file does not exist or cannot be opened!" << endl;
            result = false;
        }   

        if ( result )
        {
            cout << "Results for input file " << argv[1] << ":" << endl;
            ReadInFile(inFile, lists, count);   

            result = false;  
        }

    } while ( result );

    system("PAUSE");  
    return 0;
}
///////////////////////////////////////////////////////////////////
void ReadInFile(ifstream& inFile, node* arrayPtr[], int& count) 
{
    int number = 0;
    int newNumber = 0;
    int countResult = 0;
    node* p = new node;

    while ( inFile )   
    {

        inFile >> number;
        newNumber = number / 10000; 

        if ( !isDuplicate(arrayPtr[newNumber], number) )
        {
                arrayPtr[newNumber] = prepend( arrayPtr[newNumber], number );
                p = arrayPtr[newNumber];
        }

        count++;
    }

    for (int count = 0; count < 10; count++)
    {    
        arrayPtr[count] = p;
        countResult = counting(p);
    }

    cout << setw(7) << count << " total integers read from file" << endl << endl;

    inFile.close();    

    cout << "The " << countResult << " unique integers beginning with digit " << newNumber <<" were " << endl;

    displayIt(p, countResult);
}
/////////////////////////////////////////////////////////////////////
void displayIt(node* p, int count) 
{
    cout << setw(14); 
    print_list(p);
    cout << endl;
}
/////////////////////////////////////////////////////////////////////
bool isDuplicate(node* top, int number) 
{

    while( top != NULL )
    {

        if( top->data==number )
            return true;

        top = top->next;
    } 

    return false;
}
/////////////////////////////////////////////////////////////////////
node* prepend(node* beginning, int number) 
{
    node* p = new node;

    p->data = number;
    p->prev = NULL;
    p->next = beginning;

    if( beginning != NULL )
    {
        beginning->prev = p;
    }

    return p;
}
/////////////////////////////////////////////////////////////////////
void print_list( node* beginning ) 
{    

    for( node *p=beginning; p != NULL; p=p->next )
    {
        std::cout << p->data;

        if( p->next != NULL )
        {
            std::cout << " ";
        }

    }      
}
/////////////////////////////////////////////////////////////////////
int counting( node* beginning ) 
{
    int count(0);

    for( node *p=beginning; p != NULL; p=p->next )
    {
        ++count;
    }

    return count;
}
**********************************************

Big thanks in advance.

Marco