c语言枚举变量作为函数参数

枚举变量作为函数参数可以通过传递枚举类型的参数来实现。下面是一个示例代码：

#include <stdio.h>

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

// 函数接受枚举类型的参数
void printWeekday(enum Weekday day) {
    switch (day) {
        case Monday:
            printf("Today is Monday.\n");
            break;
        case Tuesday:
            printf("Today is Tuesday.\n");
            break;
        case Wednesday:
            printf("Today is Wednesday.\n");
            break;
        case Thursday:
            printf("Today is Thursday.\n");
            break;
        case Friday:
            printf("Today is Friday.\n");
            break;
        case Saturday:
            printf("Today is Saturday.\n");
            break;
        case Sunday:
            printf("Today is Sunday.\n");
            break;
        default:
            printf("Invalid day.\n");
            break;
    }
}

int main() {
    enum Weekday today = Tuesday;
    printWeekday(today); // 输出：Today is Tuesday.
    return 0;
}

在上面的示例中，我们定义了一个枚举类型`Weekday`，然后在`printWeekday`函数中接受一个枚举类型的参数`day`，根据传入的参数值打印对应的星期几。在`main`函数中，我们定义了一个枚举变量`today`并赋值为`Tuesday`，然后将其作为参数传递给`printWeekday`函数进行打印。