148 lines
4.2 KiB
C
148 lines
4.2 KiB
C
#include <stdio.h>
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// 基准日期：2004年5月2日（星期日）
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#define BASE_YEAR 2004
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#define BASE_MONTH 5
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#define BASE_DAY 2
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// 闰年判断：是闰年返回1，否则返回0
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int is_leap_year(int year)
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{
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return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
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}
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// 获取指定年份和月份的天数
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int get_month_days(int year, int month)
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{
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int month_days[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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if (month == 2 && is_leap_year(year))
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{
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return 29;
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}
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return month_days[month];
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}
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// 计算从"年1月1日"到"年-月-日"的总天数
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int days_from_year_start(int year, int month, int day)
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{
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int total = 0;
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for (int m = 1; m < month; m++)
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{
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total += get_month_days(year, m);
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}
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total += day;
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return total;
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}
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// 计算两个日期之间的天数差（date2 - date1，date2需晚于date1）
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int calculate_days_diff(int year1, int month1, int day1,
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int year2, int month2, int day2)
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{
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int diff = 0;
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// 同年直接相减
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if (year1 == year2)
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{
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int days_to_date1 = days_from_year_start(year1, month1, day1);
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int days_to_date2 = days_from_year_start(year2, month2, day2);
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return days_to_date2 - days_to_date1;
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}
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// 不同年：分段计算
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int total_days_year1 = is_leap_year(year1) ? 366 : 365;
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int days_to_date1 = days_from_year_start(year1, month1, day1);
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int days_left_in_year1 = total_days_year1 - days_to_date1;
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for (int y = year1 + 1; y < year2; y++)
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{
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diff += is_leap_year(y) ? 366 : 365;
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}
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int days_to_date2 = days_from_year_start(year2, month2, day2);
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diff += days_left_in_year1 + days_to_date2;
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return diff;
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}
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int zeller_calc_weekday(int year, int month, int day)
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{
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int y, c, m, d;
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if (month < 3)
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{
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m = month + 12;
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y = year - 1;
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}
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else
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{
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m = month;
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y = year;
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}
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c = y / 100;
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y = y % 100;
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d = day;
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int w = (y + y/4 + c/4 - 2*c + (26*(m+1))/10 + d - 1) % 7;
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if (w < 0)
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w += 7;
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w = w % 7;
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return w;
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}
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int main(void)
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{
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int target_year, target_month, target_day;
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// 星期映射表：索引0=星期日，1=星期一...6=星期六
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char *weekdays[] = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};
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while(1)
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{
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printf("依次输入 年 月 日（需晚于%d年%d月%d日）：", BASE_YEAR, BASE_MONTH, BASE_DAY);
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scanf("%d%d%d", &target_year, &target_month, &target_day);
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// 输入合法性校验
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if (target_year < BASE_YEAR)
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{
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printf("年份应在%d年及之后！\n", BASE_YEAR);
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continue;
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}
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if (target_month < 1 || target_month > 12)
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{
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printf("月份输入错误，请输入1-12之间的数字！\n");
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continue;
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}
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int days_of_month = get_month_days(target_year, target_month);
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if (target_day < 1 || target_day > days_of_month)
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{
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printf("%d年%d月没有%d日！\n", target_year, target_month, target_day);
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continue;
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}
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if (target_year == BASE_YEAR)
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{
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if (target_month < BASE_MONTH ||
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(target_month == BASE_MONTH && target_day < BASE_DAY))
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{
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printf("日期需晚于%d年%d月%d日！\n", BASE_YEAR, BASE_MONTH, BASE_DAY);
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continue;
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}
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}
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// 计算天数差
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int total_days = calculate_days_diff(BASE_YEAR, BASE_MONTH, BASE_DAY,
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target_year, target_month, target_day);
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// 用蔡勒公式计算星期几
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int weekday = zeller_calc_weekday(target_year, target_month, target_day);
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// 输出结果
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printf("%d年%d月%d日，距%d年%d月%d日共%d天\n",
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target_year, target_month, target_day,
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BASE_YEAR, BASE_MONTH, BASE_DAY, total_days);
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// 显示星期几
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printf("%d年%d月%d日 是 %s\n", target_year, target_month, target_day, weekdays[weekday]);
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printf("------------------------------------------------------\n");
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}
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return 0;
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} |