关于c++输入流的问题，百度后仍然无法解决我的问题

Question

 #include<iostream>
#include<ctime>
using namespace std;

struct Car
{
    char name[500];
    int year;
};
int main()
{
    int num;
    //int ch;
    cout << "how many cars do you wish to catalog?";
    cin >> num;
    //ch=cin.get();
    //cout << ch << endl;
    //while (cin.get() != '\n');
    Car *car = new Car[num];
    for (int i = 0; i < num; i++)
    { 
        cout << "Car #" << i + 1 << ":" << endl;
        cout << "please enter the make: ";
        cin.get(car[i].name,500);
        //cin.get();
        //cin.getline(car[i].name, 500).get();
        cout << "please enter the year made: ";
        cin >> car[i].year;
        //cin.get();
        //while (cin.get() != '\n');
    }
    cout << "hear is you collection: " << endl;
    for (int i = 0; i < num; i++)
        cout << car[i].year << " " << car[i].name << endl;
    delete[]car;
    return 0;
}

以上注释是问题的解决方案，使用cin.get()就可以解决问题，我会用，但是我不知道原理以及为什么出错

Answer 1

https://zhidao.baidu.com/question/223841520.html