p126e2a,b,c
(a)Node *p0=new Node('0'); Node *p1=p0 -> next=new Node('1');
(b)Node *p0=new Node('0'); Node *p1=new Node('1',p0); Node *p2=p1;
(c)Node *p0=new Node('0'); Node *p1=p0 ->next=new Node('1'); Node *p2=p1 ->next=new Node('2',p1);
(a)Node *p0=new Node('0'); Node *p1=p0 -> next=new Node('1');
(b)Node *p0=new Node('0'); Node *p1=new Node('1',p0); Node *p2=p1;
(c)Node *p0=new Node('0'); Node *p1=p0 ->next=new Node('1'); Node *p2=p1 ->next=new Node('2',p1);