很基础的东西。走一遍流程。有人说学编程最简单最笨的方法就是把书上的代码敲一遍。这个我是头文件是照抄的。.c源文件自己实现。
list.h
- typedef int ElementType;
- #ifndef _List_H
- #define _List_H
- struct Node;
- typedef struct Node *PtrToNode;
- typedef PtrToNode List;
- typedef PtrToNode Position;
- List CreatList();
- List MakeEmpty(List L);
- int IsEmpty(List L);
- int IsLast(Position P, List L);
- Position Find(ElementType X, List L);
- void Delete(ElementType X, List L);
- Position FindPrevious(ElementType X, List L);
- void Insert(ElementType X, Position P);
- void DeleteList(List L);
- Position Header(List L);
- Position First(List L);
- Position Advance(Position P);
- ElementType Retrieve(Position P);
- #endif
list.c
- #include"list.h"
- #include<stdlib.h>
- #include"fatal.h"
- struct Node
- {
- ElementType Element;
- Position Next;
- };
- List CreatList() {
- List l = malloc(sizeof(struct Node));
- if (l == NULL)
- Error("out of memory");
- l->Next = NULL;
- return l;
- }
- List MakeEmpty(List L) {
- if (L != NULL)
- DeleteList(L);
- L = malloc(sizeof(struct Node));
- if (L == NULL)
- FatalError("Out of memory");
- L->Next = NULL;
- return L;
- }
- int IsEmpty(List L) {
- return L->Next == NULL;
- }
- int IsLast(Position P, List L) {
- return P->Next == NULL;
- }
- Position Find(ElementType X, List L) {
- Position P;
- P = L->Next;
- while (P != NULL&&P->Element != X)
- {
- P = P->Next;
- }
- return P;
- }
- void Delete(ElementType X, List L) {
- Position P;
- P = FindPrevious(X, L);
- if (!IsLast(P, L)) {
- Position TmpCell = P->Next;
- P->Next = TmpCell->Next;
- free(TmpCell);
- }
- }
- Position FindPrevious(ElementType X, List L) {
- Position P;
- P = L;
- while (P->Next != NULL&&P->Next->Element != X)
- P = P->Next;
- return P;
- }
- void Insert(ElementType X, Position P) {
- Position tmpCell;
- tmpCell = malloc(sizeof(struct Node));
- if (tmpCell == NULL)
- FatalError("Out of space!!");
- tmpCell->Element = X;
- tmpCell->Next = P->Next;
- P->Next = tmpCell;
- }
- void DeleteList(List L) {
- Position p;
- p = L->Next;
- L->Next = NULL;
- while (p != NULL){
- Position tmp;
- tmp = p->Next;
- free(p);
- p = tmp;
- }
- }
- Position Header(List L) {
- return L;
- }
- Position First(List L) {
- return L->Next;
- }
- Position Advance(Position P) {
- return P->Next;
- }
- ElementType Retrieve(Position P) {
- return P->Element;
- }
fatal.h
- #include<stdio.h>
- #include<stdlib.h>
- #define Error(Str) FatalError(Str)
- #define FatalError(Str) fprintf(stderr,"%s\n",Str),exit(1)