#include <stdio.h>
#include <stdlib.h>


int isLeapYear(int year) {
    if ((year % 4 == 0 && year % 100!= 0) || (year % 400 == 0)) {
        return 1;
    }
    return 0;
}
int getDaysInMonth(int year,int month){
	scanf("%d%d",&year,&month);
	if(month==1||month==3||month==5||month==7||month==8||month==10||month==12)
	printf("31");
	else if(month==4||month==6||month==9||month==11)
	      printf("30");
	    else{
	    	if((year % 4 == 0 && year % 100!= 0) || (year % 400 == 0))
	    	printf("29");
	        else	
	        printf("28");
		}
		return 0;  
}

int getDayOfWeek(int year, int month, int day) {
    if (month < 3) {
        month += 12;
        year--;
    }
    int c = year / 100;
    int y = year % 100;
    int week = (day + 2 * month + 3 * (month + 1) / 5 + y + y / 4 + c / 4 - 2 * c + 7) % 7;
    return week;
}

/*单月日历*/
void x(int year, int month) {
    printf("%d%d\n", year, month);
    printf("日 一 二 三 四 五 六\n");

    int dayOfWeek = getDayOfWeek(year, month, 1);
    for (int i = 0; i < dayOfWeek; i++) {
        printf("   ");
    }
    int daysInMonth;
	int getDaysInMonth;
    for (int i = 1; i <= daysInMonth; i++) {
        printf("%2d ", i);
        if ((i + dayOfWeek) % 7 == 0) {
            printf("\n");
        }
    }
    if ((daysInMonth + dayOfWeek) % 7!= 0) {
        printf("\n");
    }
}
void  z(int year, int month) {
    printf("    %d%d%d%d\n", year, month, year, month + 1);
    printf("日 一 二 三 四 五 六       日 一 二 三 四 五 六\n");

    int dayOfWeek1 = getDayOfWeek(year, month, 1);
    int dayOfWeek2 = getDayOfWeek(year, month + 1, 1);

    for (int i = 0; i < dayOfWeek1; i++) {
        printf("   ");
    }

    int daysInMonth1 ;
    int daysInMonth2 ;

    int i1 = 1, i2 = 1;
    while (i1 <= daysInMonth1 || i2 <= daysInMonth2) {
        if (i1 <= daysInMonth1) {
            printf("%2d ", i1);
            i1++;
        } else {
            printf("   ");
        }

        if ((i1 + dayOfWeek1 - 1) % 7 == 0 && i1 <= daysInMonth1) {
            printf("  ");
        }

        if (i2 <= daysInMonth2) {
            printf("%2d ", i2);
            i2++;
        } else {
            printf("   ");
        }

        if ((i2 + dayOfWeek2 - 1) % 7 == 0 && i2 <= daysInMonth2) {
            printf("\n");
        }
    }
    if ((daysInMonth1 + dayOfWeek1) % 7!= 0 || (daysInMonth2 + dayOfWeek2) % 7!= 0) {
        printf("\n");
    }
}
void showMenu() {
    printf("菜单：\n");
    printf("1. 查询某年某月某日的日期是周几及该年是否为闰年\n");
    printf("2. 输入年份，输出这一年的单月日历\n");
    printf("3. 输入年份，输出这一年的双月日历（并排显示两个月）\n");
    printf("4.");
}
 int main() {
    int choice;
    int year, month, day;
    int m;
    do {
        showMenu();
        scanf("%d",&choice);

        switch (choice) {
        case 1:
            printf("请输入年份：");
            scanf("%d",&year);
            printf("请输入月份：");
            scanf("%d",&month);;
            printf("请输入日期：");
            scanf("%d",&day);

            if (year < 1583 && year == 1582 && month == 10 && day >= 5 && day <= 14) {
                printf("1582年10月5日 - 14日不存在，请重新输入。\n");
                continue;
            }

            printf("%d%d%d", year, month, day);
            switch (getDayOfWeek(year, month, day)) {
            case 0:
                printf("日\n");
                break;
            case 1:
                printf("一\n");
                break;
            case 2:
                printf("二\n");
                break;
            case 3:
                printf("三\n");
                break;
            case 4:
                printf("四\n");
                break;
            case 5:
                printf("五\n");
                break;
            case 6:
                printf("六\n");
                break;
            }

            if (is LeapYear){
                printf("%d\n", year);
            } else {
                printf("%d年不是闰年\n", year);
            }
            break;
        case 2:
            printf("请输入年份：");
            scanf("%d",&year);
            for (month = 1; month <= 12; month++) {
                x(year, month);
                printf("\n");
            }
            break;
        case 3:
            printf("请输入年份：");
            scanf("%d",&year);;
            for (month = 1; month <= 11; month += 2) {
                z(year, month);
                printf("\n");
            }
            break;
        default:
            printf("无效的选择，请重新输入。\n");
        }
    } while (choice!= 0);

    return 0;
}