单链表的基本操作

///用26个字母来实现简单的单链表的基本操作
#include<stdio.h>
#include<stdlib.h>
#define ok 1
#define error 0
#define MAXSIZE 100
typedef int ElemType;
typedef int Status;

typedef struct node
{
    ElemType data;
    struct node *next;
} node, *LinkList;

void CreatList(LinkList &L)///建立一个单链表
{
    LinkList r, p;
    r=L;

    ///插到表尾
    for(int i=0; i<26; i++)
    {
        p=(node *)malloc(sizeof(node));
        p->data='A'+i;
        r->next=p;
        r=p;
    }
    r->next=NULL;
}
/*
for(int i=25; i>=0; i--)
    {
        p=(node *)malloc(sizeof(node));

        p->data='A'+i;
        p->next=r->next;
        r->next=p;
    }
*/

Status ListFind(LinkList &L, int i, char *e)///单链表的查找
{
    LinkList p;
    p=L->next;
    int j=1;

    if(p->next==NULL || j>i)return error;

    while(p->next && j<i)
    {
        p=p->next;
        j++;
    }
    *e=p->data;
    return ok;
}

Status ListInsert(LinkList &L, int i, char e)///单链表的插入
{
    LinkList p, s;
    p=L;
    int j=1;

    if(!p || j>i)return error;
    while(p && j<i)
    {
        p=p->next;
        j++;
    }

    s=(LinkList)malloc(sizeof(node));
    s->data=e;
    s->next=p->next;
    p->next=s;
    return ok;
}

Status ListDelete(LinkList &L, int i, char *e)///单链表的删除
{
    LinkList p, s;
    p=L;
    int j=1;

    if(!p || j>i)return error;

    while(p && j<i)
    {
        p=p->next;
        j++;
    }
    s=p->next;
    *e=s->data;
    free(s);
    return ok;
}

void traverList(LinkList L)///输出单链表
{
    LinkList p;
    p=L->next;

    while(p)
    {
        printf("%c
", p->data);
        p=p->next;
    }
}
int main()
{
    int find_index, insert_index, delete_index;
    char  find_char, insert_char[2], delete_char;

    LinkList L;
    L=(LinkList)malloc(sizeof(node));
    L->next=NULL;
    CreatList(L);///创建一个单链表
    traverList(L);///输出此链表

    scanf("%d", &find_index);
    if(ListFind(L, find_index, &find_char))
        printf("输出查找元素: %c
", find_char);
    else
        printf("查找失败
");

    scanf("%d%s", &insert_index, insert_char);
    if(ListInsert(L, insert_index, insert_char[0]))
        traverList(L);///输出改变后的单链表
    else
        printf("插入失败
");

    scanf("%d", &delete_index);
    if(ListDelete(L, delete_index, &delete_char))
        printf("输出被删除元素: %c
", delete_char);
    else
        printf("删除失败
");

    return 0;
}