enum 枚舉名 {
    枚舉常量1,
    枚舉常量2,
    // 可以有更多枚舉常量
};

enum Weekday {
    Monday,
    Tuesday,
    Wednesday,
    Thursday,
    Friday,
    Saturday,
    Sunday
};

#include <stdio.h>
enum Weekday {
    Monday,
    Tuesday,
    Wednesday,
    Thursday,
    Friday,
    Saturday,
    Sunday
};
int main() {
    enum Weekday today = Wednesday;
    printf("今天是一周中的第 %d 天（從 0 開始計(jì)數(shù)）\n", today);
    return 0;
}

#include <stdio.h>
enum Month {
    January = 1,
    February,
    March,
    April,
    May,
    June,
    July,
    August,
    September,
    October,
    November,
    December
};
int main() {
    enum Month currentMonth = April;
    printf("當(dāng)前月份是第 %d 月\n", currentMonth);
    return 0;
}

#include <stdio.h>
enum Weekday {
    Monday,
    Tuesday,
    Wednesday,
    Thursday,
    Friday,
    Saturday,
    Sunday
};
void printWeekday(enum Weekday day) {
    switch (day) {
        case Monday:
            printf("星期一\n");
            break;
        case Tuesday:
            printf("星期二\n");
            break;
        case Wednesday:
            printf("星期三\n");
            break;
        case Thursday:
            printf("星期四\n");
            break;
        case Friday:
            printf("星期五\n");
            break;
        case Saturday:
            printf("星期六\n");
            break;
        case Sunday:
            printf("星期日\n");
            break;
        default:
            printf("無效的星期\n");
    }
}
int main() {
    enum Weekday today = Wednesday;
    printWeekday(today);
    return 0;
}