头歌答案c++打印日历

以下是C++打印日历的代码，可以根据用户输入的年份和月份打印出对应的日历：

#include <iostream>
using namespace std;

int main() {
    int year, month, day = 1;
    int month_day[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
    string week[7] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};

    cout << "Please enter the year: ";
    cin >> year;
    cout << "Please enter the month: ";
    cin >> month;

    // 判断是否为闰年
    if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
        month_day[1] = 29;
    }

    // 计算当月第一天是星期几
    int week_day = (year - 1 + (year - 1) / 4 - (year - 1) / 100 + (year - 1) / 400 + day) % 7;

    // 打印日历表头
    cout << "-----------------------------" << endl;
    cout << "         " << year << "年" << month << "月" << endl;
    cout << "-----------------------------" << endl;
    for (int i = 0; i < 7; i++) {
        cout << week[i] << " ";
    }
    cout << endl;

    // 打印日历
    for (int i = 0; i < week_day; i++) {
        cout << "    ";
    }
    for (int i = 1; i <= month_day[month - 1]; i++) {
        printf("%4d", i);
        if ((i + week_day) % 7 == 0) {
            cout << endl;
        }
    }
    cout << endl << "-----------------------------" << endl;

    return 0;
}