华中科技大学考研机试题 3607. 打印日期

用二维数组处理一年中每月的天数

#include <iostream>
using namespace std;

int days[2][13] = { { 0,31,28,31,30,31,30,31,31,30,31,30,31 },
                    { 0,31,29,31,30,31,30,31,31,30,31,30,31} };

bool isLeapYear(int y) {
    bool flag = true;
    if ((y % 4 == 0 && y % 100 != 0) || y % 400 == 0) {
        flag = true;
    } else {
        flag = false;
    }
    return flag;
}

int main() {
    int y, m, d;
    bool isLeap;
    while (cin >> y >> d) {
        isLeap = isLeapYear(y);
        m = 0;
        while (days[isLeap][m] < d) {
            d -= days[isLeap][m];
            m++;
        }
        printf("%04d-%02d-%02d\n", y, m, d);
    }
    return 0;
}

用一维数组处理一年中每月的天数

#include <iostream>
using namespace std;

bool isLeapYear(int y) {
    bool flag = true;
    if ((y % 4 == 0 && y % 100 != 0) || y % 400 == 0) {
        flag = true;
    } else {
        flag = false;
    }
    return flag;
}

int main() {
    int y, m, d;
    bool isLeap;
    while (cin >> y >> d) {
        int days[13] = { 0,31,28,31,30,31,30,31,31,30,31,30,31 };
        isLeap = isLeapYear(y);
        if (isLeap) {
            days[2]++; // 闰年2月多一天
        }
        m = 0;
        while (days[m] < d) {
            d -= days[m];
            m++;
        }
        printf("%04d-%02d-%02d\n", y, m, d);
    }
    return 0;
}