public void push(int item)
{
NodeN t = new NodeN(item);
t.next = top;
top = t;
}
public int pop()
{
if (top != null)
{
int item = top.data;
top = top.next;
return(item);
}
return(0);
}
void appendToTail(int d)
{
NodeN end = new NodeN(d);
NodeN n = this;
while (n.next != null)
{
n = n.next;
}
n.next = end;
}