what is going onm

[Unregistered]

////how can i get rid of all the odd numbers


#include <iostream.h>
#include <iomanip.h>



struct NODE{
int info;
NODE *next ;
};


void createList(NODE* &head);
void InsertInOrder(NODE *&head, int num);
void printList (NODE *head);
void sieve (NODE* &head);

int main()
{
NODE *head = 0;
createList(head);
printList(head);
sieve(head);
printList(head);
}
void createList(NODE* &head)
{
for (int i =2; i <= 100; i++)
{
InsertInOrder (head, i);
}
}

void InsertInOrder (NODE* &head,int num)
{
NODE *tempNode;
tempNode = new NODE ;
tempNode -> info = num;
tempNode -> next = 0;
NODE *marker = head,*back = 0;
while(marker && marker -> info <= num)
{
back = marker;
marker = marker -> next;
}

tempNode -> next = marker;
if(back)
back -> next = tempNode;
else
head = tempNode;
}

void printList(NODE *head)
{
NODE *node;
cout<<" ";
for(node = head; node; node = node -> next)
{
cout<<node -> info;
cout<< setw(5);
}
cout<<endl;
}

void sieve(NODE* &head)
{
int count = 2;
NODE *marker =head;
NODE *nodePtr = marker;
while(marker)
{
while (nodePtr != 0)
{
for (int i = 1; i <= count; i++)
{
if (!nodePtr)
break;
nodePtr = nodePtr -> next;
}
if(nodePtr)
nodePtr -> info = 0;
}
marker = marker ->next;
count = marker -> info;
}
}

[Unregistered]

Talk to Tully.....maybe he'll know how to do it. Mrs. DeBellis is only helping him, so he should be really smart soon

[Fordy]

for (int i =2; i <= 100; i++)
{
if(i%2 == 0)
{
InsertInOrder (head, i);
}
}

Havent tested it, but I guess it should work

[Prelude]

You have an access violation in the function sieve. In other words, you tried to go one link too many and the compiler choked. This seems to work okay.

void sieve(NODE* &head) 
{ 
  int count = 2; 
  NODE *marker = head; 
  NODE *nodePtr = marker; 
  while(marker->next) { 
    while (nodePtr != 0) { 
      for (int i = 1; i <= count; i++) { 
        if (!nodePtr) 
          break; 
        nodePtr = nodePtr -> next; 
      } 
      if(nodePtr) 
        nodePtr -> info = 0; 
    } 
    marker = marker -> next; 
    count = marker -> info; 
  } 
}

-Prelude