119 lines
3.6 KiB
C++
119 lines
3.6 KiB
C++
#include <iostream>
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#include <iomanip>
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#include <ctime>
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#include <string>
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#include <sstream>
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#include <cstdlib>
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// 判断闰年
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bool isLeapYear(int year) {
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return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
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}
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// 获取某个月的天数
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int daysInMonth(int year, int month) {
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if (month == 2) {
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return isLeapYear(year) ? 29 : 28;
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}
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if (month == 4 || month == 6 || month == 9 || month == 11) {
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return 30;
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}
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return 31;
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}
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// 获取某年某月1号是星期几 (0 = Sunday, 1 = Monday, ..., 6 = Saturday)
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int getFirstDayOfWeek(int year, int month) {
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std::tm timeInfo = {0};
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timeInfo.tm_year = year - 1900;
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timeInfo.tm_mon = month - 1;
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timeInfo.tm_mday = 1;
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std::mktime(&timeInfo);
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return timeInfo.tm_wday; // 0=周日, 6=周六
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}
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// 打印某年某月的日历
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void printCalendar(int year, int month) {
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// 月份名称数组
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const char* monthNames[] = {
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"January", "February", "March", "April", "May", "June",
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"July", "August", "September", "October", "November", "December"
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};
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// 获取当月天数及第一天星期几
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int days = daysInMonth(year, month);
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int startWeekday = getFirstDayOfWeek(year, month); // 0=周日
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// 打印标题（居中显示，总宽度约20个字符）
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std::cout << "\n " << monthNames[month - 1] << " " << year << "\n";
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std::cout << "Su Mo Tu We Th Fr Sa\n";
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// 打印日历网格（6行×7列 = 42格，保证完整）
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int dayCounter = 1;
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for (int i = 0; i < 42; ++i) {
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if (i < startWeekday) {
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// 月初前的空白格子
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std::cout << " ";
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} else if (dayCounter <= days) {
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// 正常日期：右对齐占2位，后跟一个空格
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std::cout << std::setw(2) << dayCounter << " ";
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++dayCounter;
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} else {
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// 月末后的空白格子
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std::cout << " ";
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}
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// 每7个格子换行
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if (i % 7 == 6) {
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std::cout << "\n";
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}
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}
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std::cout << std::endl;
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}
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// 从字符串解析 "yyyy-mm-dd" 格式，成功返回true，并将year, month, day填入
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bool parseDate(const std::string& dateStr, int& year, int& month, int& day) {
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std::istringstream iss(dateStr);
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char dash1, dash2;
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if (iss >> year >> dash1 >> month >> dash2 >> day && dash1 == '-' && dash2 == '-') {
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// 基础范围检查
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if (year >= 1 && month >= 1 && month <= 12 && day >= 1 && day <= daysInMonth(year, month)) {
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return true;
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}
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}
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return false;
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}
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// 获取当前系统时间的年份和月份
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void getCurrentYearMonth(int& year, int& month) {
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std::time_t t = std::time(nullptr);
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std::tm* now = std::localtime(&t);
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year = now->tm_year + 1900;
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month = now->tm_mon + 1;
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}
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int main(int argc, char* argv[]) {
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int year, month;
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if (argc == 2) {
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// 提供了日期参数，尝试解析
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std::string dateArg = argv[1];
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int day; // 解析出的日无需使用，仅用于校验
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if (parseDate(dateArg, year, month, day)) {
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printCalendar(year, month);
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} else {
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std::cerr << "错误：无效的日期格式或非法日期。请使用 yyyy-mm-dd 格式。\n";
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std::cerr << "示例: " << argv[0] << " 2024-12-25\n";
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return 1;
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}
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} else if (argc == 1) {
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// 无参数，显示当前月份的日历
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getCurrentYearMonth(year, month);
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printCalendar(year, month);
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} else {
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std::cerr << "用法: " << argv[0] << " [yyyy-mm-dd]\n";
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std::cerr << "若无参数，则显示当前月份的日历。\n";
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return 1;
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}
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return 0;
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} |