题解 | 打印日期(法二)

//打印日期 法二：利用NextDay 函数
#include <stdio.h>
using namespace std;
void NextDay(int& year, int& month, int& day) {
    int dayOfmonth[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    //是否是闰年
    bool isLeap;
    isLeap = year % 400 == 0 || year % 100 != 0 && year % 4 == 0;
    if (isLeap) {
        dayOfmonth[2] = 29;
    }
    ++day;
    if (day > dayOfmonth[month]) {
        day = 1;
        month++;
    }
    if (month > 12) {
        month = 1;
        year++;
    }
}
int main() {
    int year, num;
    while (scanf("%d%d", &year, &num) != EOF) {
        int next = 1; //一年中第几天
        int curmonth = 1, curday = 1; //从1.1开始
        while (1) {
            if (next == num) {
                break;
            }
            NextDay(year, curmonth, curday);
            next++;
        }
        printf("%04d-%02d-%02d\n", year, curmonth, curday);


    }
    return 0;
}