// Values of the individual days as powers of two
enum {
kMonday = 64,
kTuesday = 32,
kWednesday = 16,
kThursday = 8,
kFriday = 4,
kSaturday = 2,
kSunday = 1,
};
// Values of the individual days as powers of t
阅读背景：
将enum中表示的天数转换为人类可读的天数
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