手写了一波C++顺序表,加深理解。

最大感触:创建一个数组对象,指定数组长度(自定义创建参数length)为100,数组中每个元素都会随机分配内存(随机数据),且数组长度无法修改,只通过修改length的值来限制数组元素访问。像js、python等等之类的语言无非是将底层数据结构做了包装吧。

实现目标(对应js中array对象的部分内建函数实现):

1.创建数组2.删除数组3.显示数组每个元素4.获取数组指定位子的元素5.查找元素6.指定位子插入元素7.删除数组中指定元素
    void CreateList(SqList *&L, ElemType a[], int n); // 建立顺序表    void DestroyList(SqList *&L);    void ListEmpty(SqList *L);    int ListLength(SqList *L);    void DispList(SqList *L); // 显示数组每哥元素    bool GetElem(SqList *L, int i, ElemType &e); // 求某个位置数据元素的值(1开始)    int LocateElem(SqList *L, ElemType e); // 查找元素    bool ListInsert(SqList *&L, int i, ElemType e); // 插入元素(让第i个位置开始的所有元素一起后移)    bool ListDelete(SqList *&L, int i, ElemType &e); // 删除元素

部分代码:

#include <stdio.h>#include <stdlib.h>#define MAX_SIZE 100typedef int ElemType;typedef struct{    ElemType data[MAX_SIZE];    int length;}SqList;int main() {    printf("start\n");    SqList *L = NULL;    int n = 5;    ElemType arr[5] = {1, 2, 3, 4, 5};    ElemType newArr[5] = {7, 8, 9, 10, 6};    CreateList(L, newArr, n);    DispList(L);    ListLength(L);    ElemType result = 0;    GetElem(L, 1, result);    printf("GetElem: %d\n", result);    int locate = -1;    locate = LocateElem(L, 4);    printf("locate: %d\n", locate);    ListInsert(L, 1, 1);    DispList(L);    ElemType delResult = -1;    ListDelete(L, 4, delResult);    DispList(L);    printf("del: %d\n", delResult);    return 0;}void CreateList(SqList *&L, ElemType a[], int n) {    L = (SqList *)malloc(sizeof(SqList));    for (int i = 0; i < n; i++) {        L->data[i] = a[i];    };    L->length = n;}void DispList(SqList *L) {    for (int i = 0; i < L->length; i++) {        printf("index: %d, value: %d;\n", i, L->data[i]);    };    printf("\n");}int ListLength(SqList *L) {    printf("length: %d\n", L->length);    return L->length;}bool GetElem(SqList *L, int i, ElemType &e) {    if (i <= 0 || i > L->length) {        return false;    }    e = L->data[i - 1];    return true;}int LocateElem(SqList *L, ElemType e) {    ElemType result = -1;    for (int i = 0; i < L->length; i++) {        if (L->data[i] == e) {            result = i;            break;        }    }    return result;}bool ListInsert(SqList *&L, int i, ElemType e) {    int realIndex = i - 1;    if (realIndex < 0 || realIndex > L->length) {        return false;    }    L->length++;    for (int index = L->length; index > realIndex && index > 0; --index) {        L->data[index] = L->data[index - 1];    }    L->data[realIndex] = e;    return true;}bool ListDelete(SqList *&L, int i, ElemType &e) {    if (i < 0 || i >= L->length) {        return false;    }    e = L->data[i - 1];    L->length--;    for (int index = i - 1; index < L->length; index++) {        L->data[index] = L->data[index + 1];    }    return true;}