#include"iostream"
using namespace std;


 struct  node
{
	int data;
	struct node *next;
};
 typedef struct node Node;
 
node * reverse( node * head)
{
    node * p,*q;
	p=head->next;
	head->next = NULL;
 
	while(p!=NULL)
	{
          q=p;
	 p=p->next;    //修改q会修改p所指的值，所以必须先对p进行保护
	 q->next = head->next;
	 head->next=q;
	 
	}
	return head;
}

  
int main()
{
    node  head,*p,*q;
	int i;
	head.next=NULL;
 	for(i=0;i<10;i++)
    {
		p = new node;
		p->next=NULL;
		p->data=i;
		if(head.next==NULL)
			head.next=p;
		else
			q->next=p;
		q=p;

	}
	 
    p=head.next;
		while(p!=NULL)
	{
		cout<<p->data<<" ";
		p=p->next;
	}
    cout<<endl;

    p= reverse(&head);
	p=p->next;
    while(p!=NULL)
	{
		cout<<p->data<<" ";
		p=p->next;
	}
    cout<<endl;
	return 0;
}

注意指针在使用前必须初始化