使用临时变量删除链表

typedef struct Node *PtrToNode;
typedef PtrToNode List;
typedef PtrToNode Position;

typedef int ElementType;

struct Node
{
   ElementType Element;
   Position Next; 
};

//不使用临时变量删除链表
void DeleteList( List L )
{
    Position P;
    P = L->Next;
    L->Next = NULL;
    while( P != NULL )
    {
        free( P );
        P = P->Next;
    }  
}
//使用临时变量删除链表
void DeleteList( List L )
{
   Position P, Tmp;
   P = L->Next;
   L->Next = NULL;
   while( P != NULL )
  {
       Tmp = P->Next;
       free( P );
       P = Tmp;
  }  
}