枚举 enum

                                                                                                      
#include

enum Days
{
    Mon = 0,
    Tue,
    Thr,
    Wen,
    Fou,
    Fri,
    Sat,
    Sun
};

int main()
{
    enum Days day = Sat;

    printf("day->[%d], Sun->[%d]\n", day, Sun);

    return 0;
}