C中的enum
用法类似于enum Day{Monday = 1,Tuesday,Wednesday,Thursday,Friday,Saturday,Sunday};
sizof一个enum类型,可能是和short int长度相同,也可能和int长度相同
Day day = Monday;//但不能给它赋值int值
printf(“%d %d %d %d",day,Friday,sizeof(Day),sizeof(day));
结果是1 5 4 4
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