Insert node and delete problem <HURRY!!> <pls HELP>>

Hi, everybody
i've got someproblem about my c++
i'm in a very hurry, pls help!!!!

question1
=======================================
i tried to insert the new node alphabetically
for example, if the first data's<name> node is "bbb" , and the new node data <name> is "AAA" , "AAA" will be insert before 'bbb" , meanwhile , if the new one data is " ccc" , "ccc" will be inserted after "bbb", but the problem is, there is only one node happen in the list whihch is the first node that i input only!!!
pls help!!!

question2
=======================================
in this situation, there is only one node in my link list
but after i tried to del one node by using del function in my program, there is an error happen, i don't understand about that error, the error is not the error while compile
but it is porblem while i used the function during the program
-----------------------------------------------------------------------------
this is my source
----------------------------------------------------------------------------
// ************************************************** *
// ** Assignment 2 < comp 114 > **
// ** ----------------------------------------------**
// ** Student ID: 319090 **
// ** Name: CHottanapund Tumnoon **
// ** Instructor: Ken Chan **
// ** ----------------------------------------------**
// ** Date: Febuary 15,2002 **
// ************************************************** *

#include <stdlib.h>
#include <iostream>
#include <conio.h>
#define True 1
#include <string>
#include <windows.h> // for clear screen

using namespace std;

struct node
{
string name; // name of the passenger
string agnumb; // password for reservation
string height; // the height of the passenger
string cost; // cost of ticket
string airname; // airline name
string des; // destination
string fnum; // flight number
string aname; // name of airline
string dday; // departure day of origin
string aday; // arrival day of destination
node *link; // pointer to the next node
};

class menu
{
public:

menu(); // constructor funciton < for initialize the private members >

void mainmenu();
void newname();
void listall();
void clrscr();
void del();
void check();

private:

};

// declariung the pointer for the operation in this program
// --------------------------------------------------------
node *ptrfirst, *ptrthis, *ptrnew, *ptrlast, *previous, *cursor;
// ptrfirst = for the pointer points to the first node
// ptrthis = for the cursor that is movable to the whole link lists
// ptrlast = for the pointer points to the last node
// previous = for the cursor that point to the node before the cursor
// ptrnew = for the new node that is going to be inserted

node* list_search(node* ptrfirst,string target);


void main()
{
ptrfirst = ptrthis = ptrnew = ptrlast = NULL;

menu call;
call.mainmenu();
}

// constructor function
menu::menu() // for initialize the variable
{

}

void menu::mainmenu()
{
menu newn,list,clear,del_,check_;
int ch;

ptrfirst = ptrthis = ptrnew = ptrlast = NULL;

while(True)
{
clear.clrscr();

cout << "\n Welcome to Tom airline"
<< "\n ************************************* "
<< "\n Type '1' to enter data"
<< "\n Type '2' to enter see list"
<< "\n Type '3' to cancel the reservation"
<< "\n Type '4' to check for the reservation"
<< "\n Type '8' to quit";
cout << "\n ************************************* ";
cout << "\n Choose >> ";
cin >> ch;

// ch = getch();

switch(ch)
{
case 1: clear.clrscr();
newn.newname();
break;

case 2: clear.clrscr();
list.listall();
break;

case 3: clear.clrscr();
del_.del();
break;

case 4: clear.clrscr();
check_.check();
break;

case 8: exit(0);

default : cout<<"\n Wrong choice entered";
}
}

}

void menu::newname() // function for inserting the new passenger
{
// int i;
string c1,c2;
ptrnew = new node;

if(ptrfirst==NULL)
{
ptrfirst = ptrlast = ptrnew;

cout<<"\n\n Enter name: ";
cin >>ptrlast->name;

cout<<"\n Enter Password: ";
cin >>ptrlast->agnumb;

cout<<"\n Enter height: ";
cin >>ptrlast->height;

cout<<"\n Enter cost: ";
cin >>ptrlast->cost;

cout<<"\n Enter Name of airline: ";
cin >>ptrlast->aname;

cout<<"\n Enter destination: ";
cin>>ptrlast->des;

cout<<"\n Enter Flight number: ";
cin>>ptrlast->fnum;

cout<<"\n Enter Departure day of origin: ";
cin>>ptrlast->dday;

cout<<"\n Enter Arrival Day: ";
cin>>ptrlast->aday;

ptrlast->link=NULL;

}
else if(ptrfirst!=NULL)
{
// ptrlast->link = ptrnew;

cout<<"\n\n Enter name: ";
cin >>ptrnew ->name;

cout<<"\n Enter Password: ";
cin >>ptrnew ->agnumb;

cout<<"\n Enter height: ";
cin >>ptrnew ->height;

cout<<"\n Enter cost: ";
cin >>ptrnew ->cost;

cout<<"\n Enter Name of airline: ";
cin >>ptrnew ->aname;

cout<<"\n Enter destination: ";
cin>>ptrnew ->des;

cout<<"\n Enter Flight number: ";
cin>>ptrnew ->fnum;

cout<<"\n Enter Departure day of origin: ";
cin>>ptrnew ->dday;

cout<<"\n Enter Arrival Day: ";
cin>>ptrnew ->aday;

for(cursor = ptrfirst; ((cursor != NULL)||(cursor->name > ptrnew->name)); cursor = cursor->link)
{
if(cursor->name < ptrnew ->name)
{
ptrnew = new node;
//cursor->link = ptrnew->link;
cout << " aaaaa\n";
cursor->link = ptrnew;
ptrnew->link = cursor->link;
// cursor = ptrnew;
break;

}
break;
}

for(cursor = ptrfirst; ((cursor != NULL)||(cursor->name < ptrnew->name)); cursor = cursor->link)
{

if(cursor->name > ptrnew ->name)
{
ptrnew = new node;
// ptrnew = ptrfirst;
// ptrnew->link = ptrfirst->link;
cursor->link = ptrnew;
// ptrnew->link = cursor;
break;

}
break;
}
}


ptrlast->link=NULL;

menu newn,list,clear,del_,check_;
int ch;

while(True)
{


cout << "\n Welcome to Tom airline"
<< "\n ************************************* "
<< "\n Type '1' to re-enter data"
<< "\n Type '2' to enter see list"
<< "\n Type '3' to cancel the reservation"
<< "\n Type '4' to check for the reservation"
<< "\n Type '8' to quit";
cout << "\n ************************************* ";
cout << "\n Choose >> ";
cin >> ch;

switch(ch)
{
case 1: clear.clrscr();
newn.newname();
break;

case 2: clear.clrscr();
list.listall();
break;

case 3: clear.clrscr();
del_.del();
break;

case 4: clear.clrscr();
check_.check();
break;

case 8: exit(0);

default : cout<<"\n Wrong choice entered";
}
}


}

void menu::listall() // function for view the passenger database
{
cout << "\n\n Welcome to Tom's airline database!";
cout << "\n ----------------------------------------------";

if(ptrfirst == NULL)
{

cout << "\n Empty list";
cout << "\n ++++++++++++++++++++++++++++++++++++++++++++++";
}
else
{
ptrthis=ptrfirst;

do
{
// cout << "\n\n Welcome to Tom's airline database!";
// cout << "\n ----------------------------------------------";
cout<<"\n\n Name: "<< ptrthis->name
<<"\n Password: "<< ptrthis->agnumb
<<"\n Airline: "<< ptrthis->aname
<<"\n Destination: "<< ptrthis->des;
cout << "\n ++++++++++++++++++++++++++++++++++++++++++++++";
ptrthis = ptrthis->link;
}
while (ptrthis != NULL);
}

// cout << "\n Press anykey to return to the main menu";
// getch();

menu newn,list,clear,del_,check_;
int ch;

while(True)
{


cout << "\n Welcome to Tom airline"
<< "\n ************************************* "
<< "\n Type '1' to enter data"
<< "\n Type '2' to enter re - see list"
<< "\n Type '3' to cancel the reservation"
<< "\n Type '4' to check for the reservation"
<< "\n Type '8' to quit";
cout << "\n ************************************* ";
cout << "\n Choose >> ";
cin >> ch;

switch(ch)
{
case 1: clear.clrscr();
newn.newname();
break;

case 2: clear.clrscr();
list.listall();
break;

case 3: clear.clrscr();
del_.del();
break;

case 4: clear.clrscr();
check_.check();
break;

case 8: exit(0);

default : cout<<"\n Wrong choice entered";
}
}
}

void menu::del() // function for cancel the reservation
{
string cname;//,cname2[20];
// int cnum;
node *remove;
remove = new node;

cout << " Cancel the reservation \n";
cout << " --------------------------\n";
cout << " Name of the passenger: ";
cin >> cname;

// cout << list_search(ptrfirst,cname);

if(ptrfirst == NULL)
{
cout << " ----------------------------------------------\n";
cout << " There is no " << cname <<"'s reservation in our database! ";
}
else
{
for(cursor=ptrfirst ; cursor!=NULL ; cursor = cursor->link)
{
// cname2 = ptrthis->name;
// cnum = strcmp(cname,ptrthis->name);


if(cname == cursor->name)
{
if(cursor == ptrfirst)
{
remove = ptrfirst;
ptrfirst = ptrfirst->link;
delete remove;

cout << " ----------------------------------------------\n";
cout << " " << cname << "'s reservation has been canceled!\n";
}
else
{
previous = (previous->link = cursor);
remove = previous->link;
previous->link = remove->link;
delete remove;
}
}
else
{
cout << " ----------------------------------------------\n";
cout << " else's \n";
cout << " ----------------------------------------------\n";
cout << " There is no " << cname <<"'s reservation in our database! ";
break;
}
}

}
cout << "\n ++++++++++++++++++++++++++++++++++++++++++++++";
// cout << "\n Please press anykey to return to the main menu";
// getch();

menu newn,list,clear,del_,check_;
int ch;

while(True)
{


cout << "\n Welcome to Tom airline"
<< "\n ************************************* "
<< "\n Type '1' to enter data"
<< "\n Type '2' to enter see list"
<< "\n Type '3' to cancel more the reservation"
<< "\n Type '4' to check for the reservation"
<< "\n Type '8' to quit";
cout << "\n ************************************* ";
cout << "\n Choose >> ";
cin >> ch;

switch(ch)
{
case 1: clear.clrscr();
newn.newname();
break;

case 2: clear.clrscr();
list.listall();
break;

case 3: clear.clrscr();
del_.del();
break;

case 4: clear.clrscr();
check_.check();
break;

case 8: exit(0);

default : cout<<"\n Wrong choice entered";
}
}
}

void menu::check()
// funciton for checking weather the ticket has been booked by
// xxx < name of the passenger > or not
{
string ccname;

cout << " Check the reservation \n";
cout << " --------------------------\n";
cout << " Name of the passenger: ";
cin >> ccname;

if(ptrfirst == NULL)
{
cout << " ----------------------------------------------\n";
cout << " There is no reservation's data in our database! ";
}

for(ptrthis=ptrfirst;ptrthis!=NULL;ptrthis = ptrthis->link)
{
if(ccname == ptrthis->name)
{
cout << " ----------------------------------------------\n";
cout << " " << ccname << "'s reserved the seat with us already!\n";
}
}

cout << "\n ++++++++++++++++++++++++++++++++++++++++++++++";
// cout << "\n Please press anykey to return to the main menu";
// getch();

menu newn,list,clear,del_,check_;
int ch;

while(True)
{


cout << "\n Welcome to Tom airline"
<< "\n ************************************* "
<< "\n Type '1' to enter data"
<< "\n Type '2' to enter see list"
<< "\n Type '3' to cancel the reservation"
<< "\n Type '4' to re-check for the reservation"
<< "\n Type '8' to quit";
cout << "\n ************************************* ";
cout << "\n Choose >> ";
cin >> ch;

switch(ch)
{
case 1: clear.clrscr();
newn.newname();
break;

case 2: clear.clrscr();
list.listall();
break;

case 3: clear.clrscr();
del_.del();
break;

case 4: clear.clrscr();
check_.check();
break;

case 8: exit(0);

default : cout<<"\n Wrong choice entered";
}
}
}

void menu::clrscr() // clear screen function
{

HANDLE hndl = GetStdHandle(STD_OUTPUT_HANDLE);
CONSOLE_SCREEN_BUFFER_INFO csbi;
GetConsoleScreenBufferInfo(hndl, &csbi);
DWORD written;
DWORD N = csbi.dwSize.X * csbi.dwCursorPosition.Y +
csbi.dwCursorPosition.X + 1;
COORD curhome = {0,0};

FillConsoleOutputCharacter(hndl, ' ', N, curhome, &written);
csbi.srWindow.Bottom -= csbi.srWindow.Top;
csbi.srWindow.Top = 0;
SetConsoleWindowInfo(hndl, TRUE, &csbi.srWindow);
SetConsoleCursorPosition(hndl, curhome);

}

/*node* list_search(node* ptrfirst,string target)
{
node *cursor, *pre;

for(cursor = ptrfirst; cursor != NULL; cursor = cursor->link)
{
// pre = pre->link = target;
if(target == cursor->name)
{
//cursor = pre->link;
//pre = pre->link;
// pre->link = cursor;

return cursor;
// return pre;
}

}
return NULL;
}
*/

--------------------------------------------------------------------------------
Thank you everybody
TOM :( :(

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