Add the entry to the linked list using c++

Posted Date: 24 Aug 2009	Resource Type: Code Snippets	Category: General
Author: Santosh Kumar Singh	Member Level: Gold
Rating:	Points: 4

////////////////////////////////////////
#include
#include

////////////////////////////////////////
// The ListEntry class.
////////////////////////////////////////
class ListEntry
{
char* listvalue;
ListEntry* preventry;

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

// Use the 'this' pointer to chain the list.
void AddEntry(ListEntry& le)
{ le.preventry = this; }
};

// The constructor definition.
ListEntry::ListEntry(char* s)
{
listvalue = new char[std::strlen(s)+1];
std::strcpy(listvalue, s);
preventry = 0;
}

////////////////////////////////////////
// The main() function.
////////////////////////////////////////
int main()
{
ListEntry* prev = 0;

// Read in some names.
while (1)
{
std::cout << std::endl
<< "Enter 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.
ListEntry* list = new ListEntry(name);

// Add the entry to the linked list.
if (prev != 0)
prev->AddEntry(*list);
prev = list;
}

// Display the names in reverse order.
while (prev != 0)
{
prev->display();
ListEntry* hold = prev;
prev = prev->PrevEntry();

// Delete the ListEntry object.
delete hold;
}

return 0;
}

Responses

Author: Miss Meetu Choudhary 27 Aug 2009

Member Level: Diamond Points : 2

Must Add Description to your code

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