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only for study, no oop
一般情况下: = 0 成功返回(仅状态标志,标志函数运行没有出错) < 0 异常返回 > 0 正常返回(不仅代表函数没有出错,而且返回函数执行的结果以便调用方使用)
= 0
< 0
> 0