线性表链式存储

参考书籍：《大话数据结构》
环境：VS2017

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<time.h>

#define OK 1
#define ERROR 0
#define TRUE 1
#define FALSE 0

#define MAXSIZE 20

typedef int Status;
typedef int Elemtype;

Status visit(Elemtype c)
{
    printf("%d ", c);
    return 0;
}

typedef struct Node
{
    Elemtype data;
    struct Node *Next;
}Node;
typedef struct Node *LinkList;

Status InitList(LinkList *L)
{
    *L = (LinkList)malloc(sizeof(Node));
    if (!(*L))
    {
        return ERROR;
    }
    (*L)->Next = NULL;
    return OK;
}

Status ListEmpty(LinkList L)
{
    if (L->Next)
        return TRUE;
    else
        return FALSE;
}

Status ClearList(LinkList *L)
{
    LinkList p, q;
    p = (*L)->Next;
    while (p)
    {
        q = p->Next;
        free(p);
        p = q;
    }
    (*L)->Next = NULL;
    return OK;
}

int ListLength(LinkList L)
{
    int i = 0;
    LinkList p = L->Next;
    while (p)
    {
        p = p->Next;
        i++;
    }
    return i;
}

Status GetElem(LinkList L, int i, Elemtype *e)
{
    int j;
    LinkList p;
    p = L->Next;
    j = 1;
    while (p && j<i)
    {
        p = p->Next;
        ++j;
    }
    if (j > i || !p)
    {
        return ERROR;
    }
    *e = p->data;
    return OK;
}

Status LocateElem(LinkList L, Elemtype e)
{
    int i = 0;
    LinkList p = L->Next;
    while (p)
    {
        i++;
        if (p->data == e)
            return i;
        p = p->Next;
    }
    return 0;
}

Status ListInsert(LinkList *L, int i, Elemtype e)
{
    int j;
    LinkList p, s;
    p = *L;
    j = 1;
    while (p && j<i)
    {
        p = p->Next;
        ++j;
    }
    if (!p || j > i)
    {
        return ERROR;
    }
    s = (LinkList)malloc(sizeof(Node));
    s->data = e;
    s->Next = p->Next;
    p->Next = s;
    return OK;
}

Status ListDelete(LinkList *L, int i, Elemtype *e)
{
    int j;
    LinkList p, q;
    p = *L;
    j = 1;
    while (p->Next && j < i)
    {
        p = p->Next;
        ++j;
    }
    if (!(p->Next) || j > i)
    {
        return ERROR;
    }
    q = p->Next;
    p->Next = q->Next;
    *e = q->data;
    free(q);
    return OK;
}

Status ListTraverse(LinkList L)
{
    LinkList p = L->Next;
    while (p)
    {
        visit(p->data);
        p = p->Next;
    }
    printf("\n");
    return OK;
}

void CreateListHead(LinkList *L, int n)//头插法
{
    LinkList p;
    int i;
    srand(time(0));
    *L = (LinkList)malloc(sizeof(Node));
    (*L)->Next = NULL;
    for (i = 0; i < n; i++)
    {
        p = (LinkList)malloc(sizeof(Node));
        p->data = rand() % 100 + 1;
        p->Next = (*L)->Next;
        (*L)->Next = p;
    }
}

void CreateListTail(LinkList *L, int n)
{
    LinkList p, r;
    int i;
    srand(time(0));
    *L = (LinkList)malloc(sizeof(Node));
    r = *L;
    for (i = 0; i < n; i++)
    {
        p = (Node *)malloc(sizeof(Node));
        p->data = rand() % 100 + 1;
        r->Next = p;
        r = p;
    }
    r->Next = NULL;
}

int main()
{
    LinkList L;
    Elemtype e;
    Status i;
    int j, k;
    i = InitList(&L);
    printf("初始化L后：ListLength(L)=%d\n", ListLength(L));
    for (j = 1; j <= 5; j++)
        i = ListInsert(&L, 1, j);
    printf("在L的表头依次插入1～5后：L.data=");
    ListTraverse(L);

    printf("ListLength(L)=%d \n", ListLength(L));
    i = ListEmpty(L);
    printf("L是否空：i=%d(1:是 0:否)\n", i);

    i = ClearList(&L);
    printf("清空L后：ListLength(L)=%d\n", ListLength(L));
    i = ListEmpty(L);
    printf("L是否空：i=%d(1:是 0:否)\n", i);

    for (j = 1; j <= 10; j++)
        ListInsert(&L, j, j);
    printf("在L的表尾依次插入1～10后：L.data=");
    ListTraverse(L);

    printf("ListLength(L)=%d \n", ListLength(L));

    ListInsert(&L, 1, 0);
    printf("在L的表头插入0后：L.data=");
    ListTraverse(L);
    printf("ListLength(L)=%d \n", ListLength(L));

    GetElem(L, 5, &e);
    printf("第5个元素的值为：%d\n", e);
    for (j = 3; j <= 4; j++)
    {
        k = LocateElem(L, j);
        if (k)
            printf("第%d个元素的值为%d\n", k, j);
        else
            printf("没有值为%d的元素\n", j);
    }


    k = ListLength(L); /* k为表长 */
    for (j = k + 1; j >= k; j--)
    {
        i = ListDelete(&L, j, &e); /* 删除第j个数据 */
        if (i == ERROR)
            printf("删除第%d个数据失败\n", j);
        else
            printf("删除第%d个的元素值为：%d\n", j, e);
    }
    printf("依次输出L的元素：");
    ListTraverse(L);

    j = 5;
    ListDelete(&L, j, &e); /* 删除第5个数据 */
    printf("删除第%d个的元素值为：%d\n", j, e);

    printf("依次输出L的元素：");
    ListTraverse(L);

    i = ClearList(&L);
    printf("\n清空L后：ListLength(L)=%d\n", ListLength(L));
    CreateListHead(&L, 20);
    printf("整体创建L的元素(头插法)：");
    ListTraverse(L);

    i = ClearList(&L);
    printf("\n删除L后：ListLength(L)=%d\n", ListLength(L));
    CreateListTail(&L, 20);
    printf("整体创建L的元素(尾插法)：");
    ListTraverse(L);

    system("pause");
    return 0;
}