vc++相关程序问题

vc++相关程序问题以及其结构体与简单链表相关问题……谢谢了……

定义如下的结构体：

#include <iostream>
using namespace std;

typedef struct _mydate
{
    int y, m, d;
}MyDate;

int main()
{
    MyDate d;
    d.y = 2022;
    d.m = 6;
    d.d=24;
    cout << "今天是" << d.y << "年" << d.m << "月" << d.d << "日" << endl;
    return 0;
}

2：

#include <iostream>
using namespace std;

typedef struct _mydate
{
    int y, m, d;
}MyDate;

int main()
{
    MyDate d[3];
    d[0].y = 2022;
    d[0].m = 6;
    d[0].d = 23;
    d[1].y = 2022;
    d[1].m = 6;
    d[1].d = 24;
    d[2].y = 2022;
    d[2].m = 6;
    d[2].d = 25;
    cout << "昨天是" << d[0].y << "年" << d[0].m << "月" << d[0].d << "日" << endl;
    cout << "今天是" << d[1].y << "年" << d[1].m << "月" << d[1].d << "日" << endl;
    cout << "明天是" << d[2].y << "年" << d[2].m << "月" << d[2].d << "日" << endl;
    return 0;
}

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