用C定义一个满足如下要的Date类用构造函数完成初始化：

#include <stdio.h>

// Date类的定义
typedef struct {
    int year;
    int month;
    int day;
} Date;

// 构造函数，用于初始化Date对象
Date createDate(int year, int month, int day) {
    Date d;
    d.year = year;
    d.month = month;
    d.day = day;
    return d;
}

int main() {
    // 使用构造函数初始化Date对象
    Date myDate = createDate(2022, 1, 5);

    // 输出Date对象的成员变量值
    printf("Year: %d, Month: %d, Day: %d\n", myDate.year, myDate.month, myDate.day);

    return 0;
}

#include <stdio.h>
#include <stdlib.h>

typedef struct {
    int year;
    int month;
    int day;
} Date;

Date createDate(int year, int month, int day) {
    Date d;
    d.year = year;
    d.month = month;
    d.day = day;
    return d;
}

// 计算两个日期之间的天数差
int daysDifference(Date date1, Date date2) {
    // 假设每个月有30天，不考虑闰年等情况
    return abs((date2.year - date1.year) * 360 + (date2.month - date1.month) * 30 + (date2.day - date1.day));
}

// 日期的加法运算
Date addDays(Date date, int days) {
    // 假设每个月有30天，不考虑闰年等情况
    date.day += days;
    while (date.day > 30) {
        date.month++;
        date.day -= 30;
        if (date.month > 12) {
            date.year++;
            date.month -= 12;
        }
    }
    return date;
}

int main() {
    Date today = createDate(2022, 1, 5);
    Date futureDate = addDays(today, 20);

    printf("Today: %d-%d-%d\n", today.year, today.month, today.day);
    printf("Future Date: %d-%d-%d\n", futureDate.year, futureDate.month, futureDate.day);
    printf("Days Difference: %d\n", daysDifference(today, futureDate));

    return 0;
}