STL(标准模板库)02

用户7272142

发布于 2023-11-02 09:23:09

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发布于 2023-11-02 09:23:09

有了上节笔记的基础，本篇我们就可以写一些例子来巩固知识我们用动态数组vector编写一个书架，这个书架可以上架图书和浏览图书

#include<iostream>
#include<vector>
#include<string>
struct Riview {
    std::string title;
    int rating;
};
bool FillReview(Riview& rv);
void Show(const Riview& rr);
int main()
{
    using std::cout;
    using std::vector;
    vector<Riview> Books;
    Riview temp;
    while (FillReview(temp))
    {
        Books.push_back(temp);
    }
    int num = Books.size();
    for (size_t i = 0; i < num; i++)
    {
        Show(Books[i]);
    }
    cout << "Reprising:\n"
        << "Rating\tBook\n";
    vector<Riview>::iterator pd;
    for (pd = Books.begin(); pd != Books.end(); pd++)
    {
        Show(*pd);
    }
    vector<Riview> oldlist(Books);
    if (num>3)
    {
        Books.erase(Books.begin() + 1, Books.begin() + 3);
        cout << "删除第二个图书到第3个图书后.\n";
        for (pd = Books.begin(); pd!=Books.end(); pd++)
        {
            Show(*pd);
        }
        Books.swap(oldlist);
        cout << "交换两个书架的容器数据后.\n";
        for (pd = Books.begin(); pd != Books.end(); pd++)
        {
            Show(*pd);
        }

    }
    else
    {
        cout << "error.\n";
    }
    return 0;
}

bool FillReview(Riview& rv)
{
    std::cout << "请输入你书籍的名字: ";
    std::getline(std::cin, rv.title);
    if (rv.title == "quit")
    {
        return false;
    }
    std::cout << "请输入图书编号: ";
    std::cin >> rv.rating;
    if (!std::cin)
    {
        return false;
    }
    while (std::cin.get()!='\n')
    {
        continue;
    }
    return true;
}

void Show(const Riview& rr)
{
    std::cout << rr.rating << '\t' << rr.title << std::endl;
}

Q:定义一个 int 类型的 vector 动态数组，将以下元素：1, 4, 3, 7, 9, 3, 6, 8, 3, 5, 2, 3, 7 插入到动态数组中。之后，使用 for 循环删除动态数组中的值为 3 的元素，并将结果输出出来！

#include<vector>
#include<iostream>
int main()
{
    using std::vector;
    int arr[] = { 1, 4, 3, 7, 9, 3, 6, 8, 3, 5, 2, 3, 7 };
    vector<int> arr_int(arr, arr + sizeof(arr) / sizeof(int));
    vector<int>::iterator pr;
    for (pr = arr_int.begin(); pr!=arr_int.end(); pr++)
    {
        if (*pr == 3)
        {
            pr = arr_int.erase(pr);
        }
    }
    int num = arr_int.size();
    std::cout << "arr_int = ";
    for (int i = 0; i < num; i++)
    {
         std::cout<< '\t' << arr_int[i];
    }

}