C++ Lists: A Simple List Of Items

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;

}

}

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

Source File: Main.cpp

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

#include

#include

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;

}

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