pr11024.cpp

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////////////////////////////////////////
// File Name: pr11024.cpp
////////////////////////////////////////
#include <iostream>
#include <cstring>

////////////////////////////////////////
// The ListEntry class.
////////////////////////////////////////
class ListEntry
{
public:
    // Static list head pointer.
    static ListEntry* firstentry;

private:
    // Static list tail pointer.
    static ListEntry* lastentry;

    char* listvalue;
    ListEntry* nextentry;

public:
    ListEntry(char*);
    ~ListEntry()
        { delete [] listvalue;}
    ListEntry* NextEntry() const
        { return nextentry; };
    void display() const
        { std::cout << listvalue << std::endl; }
};

// Define the static pointers.
ListEntry* ListEntry::firstentry; // static list head pointer.
ListEntry* ListEntry::lastentry;  // static list tail pointer.

// The constructor.
ListEntry::ListEntry(char* s)
{
    if (firstentry == 0)
        firstentry = this;
    if (lastentry != 0)
        lastentry->nextentry = this;
    lastentry = this;
    listvalue = new char[std::strlen(s)+1];
    std::strcpy(listvalue, s);
    nextentry = 0;
}

////////////////////////////////////////
// The main() function.
////////////////////////////////////////
int main()
{
    // Read in some names.
    while (1)
    {
        std::cout << "\nEnter a name ('end' when done): ";
        char name[25];
        std::cin >> name;

        if (std::strncmp(name, "end", 3) == 0)
            break;

        // Make a list entry of the name.
        new ListEntry(name);
    }

    // Get a pointer to the first list entry.
    ListEntry* next = ListEntry::firstentry;

    // Display the names.
    while (next != 0)
    {
        next->display();
        ListEntry* hold = next;
        next = next->NextEntry();
        delete hold;
    }

    return 0;
}