C++ Lists: A Simple List Of Items

This example illustrates a simple list of items such as a list of integers, characters, etc.

Header File: List.h

//---------------------------------------------------------------------------

#ifndef ListH

#define ListH

//---------------------------------------------------------------------------

const int MaxItems = 100;

typedef double ItemType;



class FList

{

public:

    FList();

    virtual ~FList();

    int Count() const;

    bool Add(const ItemType NewItem);

    ItemType Retrieve(const int Pos);

    bool Delete(const int Pos);



private:

    int Counter;

    ItemType Item[MaxItems];

    const Index(const int Pos) const;

};

//---------------------------------------------------------------------------

#endif

Source File: List.cpp

//---------------------------------------------------------------------------

#pragma hdrstop



#include "List.h"

//---------------------------------------------------------------------------

#pragma package(smart_init)

FList::FList()

    : Counter(0)

{

}

//---------------------------------------------------------------------------

FList::~FList()

{

}//---------------------------------------------------------------------------

int FList::Count() const

{

    return Counter;

}

//---------------------------------------------------------------------------

const FList::Index(const int Pos) const

{

    return Pos-1;

}

//---------------------------------------------------------------------------

bool FList::Add(const ItemType NewItem)

{

    if( (Counter < 0) || (Counter > MaxItems) )

        return false;

    else

    {

        Item[Counter] = NewItem;

        Counter++;

        return true;

    }

}

//---------------------------------------------------------------------------

ItemType FList::Retrieve(const int Pos)

{

    if( (Pos < 0) || (Pos > Counter) )

        return 0;

    else

        return Item[Pos];

}

//---------------------------------------------------------------------------

bool FList::Delete(const int Pos)

{

    if( (Pos < 0) || (Pos > Counter) )

        return false;

    else

    {

        for(int i = Pos+1; i <= Counter; i++)

            Item[Index(i-1)] = Item[Index(i)];

        Counter--;

        return true;

    }

}

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Source File: Main.cpp

//---------------------------------------------------------------------------

#include <iostream>

#include <conio>

using namespace std;

#pragma hdrstop

#include "List.h"

//---------------------------------------------------------------------------



#pragma argsused

int main(int argc, char* argv[])

{

    FList List;



    List.Add(1240.42);

    List.Add(283.15);

    List.Add(42.48);

    List.Add(582.12);

    List.Add(60.14);

    List.Add(8022.28);



    cout << "List of items";

    for(int i = 0; i < List.Count(); i++)

        cout << "\nItem No." << i + 1 << ": " << List.Retrieve(i);

    cout << "\nNumber of items: " << List.Count() << " items\n\n";



    List.Delete(5);

    List.Delete(2);

    cout << "List of items";

    for(int i = 0; i < List.Count(); i++)

        cout << "\nItem No." << i + 1 << ": " << List.Retrieve(i);

    cout << "\nNumber of items: " << List.Count() << " items\n\n";



    cout << "Press any key to continue...";

    getch();

    return 0;

}

//---------------------------------------------------------------------------