cpp中vector动态数组（一种container）的简单用法

Posted 2020-11-19 htj10

　　 vector<int> num;
    for (int i=0; i<10; ++i)num.push_back(i);
    num.push_back(10);
    num.push_back(10);
    cout << "Original array:
";
    //vector<int>::iterator it;  //C++11之前用的，11之后可以用auto
    for (auto it=num.begin(); it!=num.end(); ++it)
    {
        cout << *it << "  ";
    }
    cout << endl;
    num.insert(num.begin()+2,3,10); //在num[2]之前加3个10
    cout << "Inserted array:
";
    for (auto it=num.begin(); it!=num.end(); ++it)
    {
        cout << *it << "  ";
    }
    cout << endl;
    //delete 10
    for (auto it=num.begin(); it!=num.end(); ++it)
    {
        if ( *it == 10 )
        {
            num.erase(it); //删除it指向的元素，后it自动指向下一个元素
            --it;
        }
    }
    cout << "Deleted 10 array:
";
    for (auto it=num.begin(); it!=num.end(); ++it)
    {
        cout << *it << "  ";
    }

　　运行结果：