edit6.c

里面有很多的例子

void delet()
{
	llist *p,*q;
	int x;
	if(head==NULL)printf("error\n");
	printf("input your choice:")  ;
     scanf("%d",&x);
	if(head->data==x)
	{
		p=head;
		head=head->next;
		head->pro=NULL;
		free(p);
	}
        else
        {
        	p=head->next;
        	while(p!=NULL&&p->data!=x)
        	{
        		if(p->data!=x)p=p->next;
        		if(p!=NULL)
        		{
        			if(p->next==NULL)
        			{
        				p->pro->next=NULL;
        				free(p);
        			}
				else
				 {
					p->pro->next=p->next;
					p->next->pro=p->pro;
					free(p);
				  }
			}
        		 else
        		  	 printf("error\n");
		}
	}
}