For example, if a function returns an unsigned char value but calculated a result of 256 or more (or -1 or less), errno would be set to ERANGE and the function would return some irrelevant value.

例如，如果函数返回unsigned char值，但计算的结果为256或更多(或者是- 1或更少)，则errno将被设置为ERANGE且函数会返回一些不相关的值。

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