c++

[sairakhalid]

#include<iostream>
#include<time.h>
#include<conio.h>
using namespace std;



class adclist
{
	
	struct list
	{

	int data;
     list* next;
	};



	public:
	void makelist();






};

void adclist::makelist()
{

 list** table = new list* [10];
for(int j =0; j < 10 ; j++)
table[j]  = NULL;

for ( int m =0; m < 10; m++)
{

int x;
cout<<"enter your value"<<endl;
cin>>x;
list* newptr = new list;
newptr->data = x;
newptr->next = NULL;

int y =   rand() %9 ;
//.................................................
// WHATS THE MISTAKE IN THIS SEGMENT..........???????????
list* head = new list;
head = table[y] ;
if (head == NULL)
{
	 head->data = x;
	 head->next = NULL;
     table[y] = head;

}
//.................................
else
{

list* temp = table[y];
while( temp->next!= NULL)
{
	temp = temp->next; 	
}
temp->next = newptr;
}

}

int exit;
cout<<"IF  NO  MORE DATA  ...PLEASE PRESS 1 FOR DISPLAYING UR ADJACENCY LSIT"<<endl;
cin>>exit;
 list* temptr;
if ( exit  == 1)
{
	for ( int m =0; m < 10; m++)
	{
		temptr = table[m];
	while( temptr!= NULL) 
	{
		cout<<m<<" -> "<<temptr->data;
		temptr = temptr->next;

	}

	if ( temptr == NULL)
		cout<<endl<<endl;
	}
}




}

int main()
{

adclist l1;

l1.makelist();

getch();
	return 0;
}

[sairakhalid]

if i use table[y] instead of head in the error part of the code segment.. than it works fine. But why it isn't working this way?

[Fbody]

Please define "it works fine" and "it isn't working". Without a program description, we have no way of knowing what is correct and what isn't.

[sairakhalid]

i mean if i write the error segment in the following way:
if ( table[y] == NULL )
{
table[y] = newptr;
}

the the adjacency list is printed . but if we don't write in this manner, nothing is printed and the screen remains blank. that means the adjacency list is not being made. I want to know whats the logic behind this? y we cannot use head pointer instead of table[y]?