第一章数据结构——实现线性表

#include<stdio.h>
#include<stdlib.h>
#include<malloc.h>
#define LIST_INIT_SIZE 100
#define LISTINCREMENT 10
#define OVERFLOW -2
#define ERROR 0
#define OK 1
using namespace std;
//typedef int Status;
typedef struct
{
    int *elem;  //指向整个线性表的基址
    int length;  //当前长度
    int listsize;  //总容量(以sizeof(ElemType)为单位)
}SqList;
int InitList_Sq(SqList &L)  //构建有序表
{
    L.elem = NULL;
    L.elem = (int *)malloc(LIST_INIT_SIZE * sizeof(int));  //给表申请动态空间，最多存100个整形数据
    if(!L.elem) exit(OVERFLOW);  //申请失败
    L.length = 0;
    L.listsize = LIST_INIT_SIZE;
    return OK;
}
int ListInsret_Sq(SqList &L,int i,int e)  //在第i个位置插入元素e
{
    if(i < 1 || i > L.length + 1) return ERROR;
    if(L.length >= L.listsize)
    {
        //更改内存大小，新的大小一定要大于原来的大小，不然的话会导致数据丢失
        int *newbase = (int *)realloc(L.elem,(L.listsize + LISTINCREMENT)*sizeof(int));
        if(!newbase) exit(OVERFLOW);
        L.elem = newbase;
        L.listsize += LISTINCREMENT;
    }
    int *q = &(L.elem[i - 1]);  //申请的elem是一连串的。这里不好懂。
    for(int *p = &(L.elem[L.length - 1]);p >= q;--p) *(p + 1) = *p;
    *q = e;
    ++L.length;
    return OK;
}
int ListDelete_Sq(SqList &L,int i,int &e)  //删除第i个元素，而且返回e的值
{
    if(i < 1 || i > L.length) return ERROR;
    int *p = &(L.elem[i - 1]);  //p为第i个元素的地址
    e = *p;
    int *q = L.elem + L.length - 1;  //q为最后一个元素的地址
    for(++p;p <= q;++p) *(p - 1) = *p;
    --L.length;
    return OK;
}
int ListSearch_Sq(SqList &L,int e,int &i)
{
    int temp = 0,flag = 1;
    int *p,*q = &(L.elem[L.length - 1]);
    for(p = &L.elem[0];p <= q;p ++)
    {
        temp++;
        if(*p == e)
        {
            i = temp;
            flag = 1;
        }
    }
    if(!flag) return ERROR;
    else return OK;
}
int main()
{
//    freopen("out.txt","w",stdout);
    SqList a,b;
    InitList_Sq(a);
    InitList_Sq(b);
    ListInsret_Sq(a,1,1);
    ListInsret_Sq(a,2,2);
    ListInsret_Sq(a,3,3);
    ListInsret_Sq(a,4,4);
    ListInsret_Sq(a,5,5);
    ListInsret_Sq(a,6,6);
    ListInsret_Sq(a,7,7);
    ListInsret_Sq(a,8,8);
    ListInsret_Sq(a,9,9);
    ListInsret_Sq(b,1,4);
    ListInsret_Sq(b,2,5);
    ListInsret_Sq(b,3,6);
    ListInsret_Sq(b,4,7);
    ListInsret_Sq(b,5,8);
    ListInsret_Sq(b,6,9);
    int i;
    ListDelete_Sq(a,3,i);
    printf("您删除了：%d
",i);
    ListSearch_Sq(a,4,i);
    printf("这个元素在第%d个位置
",i);
    return 0;
}

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