How to represent enums as parameters in the C language?

In C language, enums can be used as parameters in functions. The specific syntax is as follows:

#include <stdio.h>

// 定义一个枚举类型
enum Weekday {
    Monday,
    Tuesday,
    Wednesday,
    Thursday,
    Friday,
    Saturday,
    Sunday
};

// 函数接受一个枚举类型作为参数
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("无效的日期\n");
            break;
    }
}

int main() {
    enum Weekday today = Tuesday;
    printWeekday(today);
    return 0;
}

In the example above, we defined an enum type Weekday to represent the work days of a week. Then, we defined a function called printWeekday that takes a parameter day of type Weekday and prints out the corresponding day of the week based on the value of day. In the main function, we created a variable today of type Weekday and assigned it the value Tuesday, then passed today as a parameter to the printWeekday function.

The outcome will be:

星期二