void LinkList::sort( )
{
Node *q, *r;
for( q = p ; q->link != NULL ; q = q->link )
{
for( r = q->link ; r->link != NULL ; r = r->link )
{
if (r->data<q->data)
{
int temp;
temp = r->data;
r->data = q->data;
q->data = temp;
}
}
}
}