151 lines
3.3 KiB
C
151 lines
3.3 KiB
C
#include <stdio.h>
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int main() {
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int choice;
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int j,k,l,m,n;
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printf("菜单选项：\n");
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printf("1.查询对应年份的日历\n");
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printf("2.查询对应日期的星期\n");
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printf("3.查询对应年份是否为闰年\n");
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printf("4.退出\n");
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printf("请输入你的选择(1-4)：");
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scanf("%d", &choice);
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start:
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switch (choice) {
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case 1:
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printf("请输入需要查询的年份\n");
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int year;
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scanf("%d", &year);
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int month,day;
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int i,k;
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// 单列输出日历
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printf("单列日历输出如下：\n");
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for (month = 1; month <= 12; month++) {
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// 每个月的天数数组，先按非闰年设置，后续根据是否闰年调整2月天数
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int daysInMonth[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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if ((year % 4 == 0 && year % 100!= 0) || year % 400 == 0) {
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daysInMonth[1] = 29;
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}
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// 计算该月1号是星期几，蔡氏公式简化版思路
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int y = year % 100;
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int c = year / 100;
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if (month < 3) {
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y -= 1;
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c -= 1;
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}
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int firstDay = (1 + (13 * (month + 1) / 5) + y + (y / 4) + (c / 4) - 2 * c) % 7;
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firstDay = firstDay < 0? firstDay + 7 : firstDay;
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// 输出月份标题
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printf(" %d年%d月\n", year, month);
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printf("日 一 二 三 四 五 六\n");
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// 输出该月1号前的空格
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for (i = 0; i < firstDay; i++) {
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printf(" ");
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}
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// 输出该月每天的日期
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int numDays = daysInMonth[month - 1];
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for (day = 1; day <= numDays; day++) {
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printf("%2d ", day);
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if ((firstDay + day) % 7 == 0) {
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printf("\n");
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}
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}
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// 如果该月最后一行不满7个，补充换行
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if ((firstDay + numDays) % 7!= 0) {
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printf("\n");
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}
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printf("\n");
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}
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break;
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case 2:
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printf("请输入需要查询的日期\n");
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{
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printf("请输入该查询的年份：\n");
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scanf("%d",&year);
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printf("请输入该查询的月份：\n");
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scanf("%d",&month);
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printf("请输入该查询的日期: \n");
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scanf("%d",&day);
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if(month<3)
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{
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year--;
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month+=12;
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}
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k=year%100;j=year/100;l=day;m=month;
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n=(l+(26*(m+1)/10)+k+(k/4)+(j/4)+5*j)%7;
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switch(n)
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{
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case 0:
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printf("星期六");
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break;
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case 1:
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printf("星期日");
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break;
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case 2:
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printf("星期一");
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break;
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case 3:
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printf("星期二");
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break;
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case 4:
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printf("星期三");
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break;
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case 5:
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printf("星期四");
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break;
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case 6:
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printf("星期五");
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break;
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}
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break;
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}
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case 3:
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printf("请输入需要查询的年份\n");
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{
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int year;
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printf("请输入一个年份：");
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scanf("%d", &year);
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if ((year % 4 == 0 && year % 100!= 0) || year % 400 == 0) {
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printf("%d年是闰年\n", year);
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} else {
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printf("%d年不是闰年\n", year);
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}
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}
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break;
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case 4:
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printf("正在退出程序...\n");
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break;
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default:
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printf("无效的选择，请重新输入(1~4)\n");
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scanf("%d",&choice);
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if(choice<=4)
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{
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goto start;
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}
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}
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return 0;
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}
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