The checked forms check for overflow and generate a runtime exception if the resulting value exceeds the limits of the target type.

执行检查形式将会检查溢出情况，如果结果值超出目标类型的限制，则会生成运行时异常。

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To avoid any division by zero or overflow, transform all division into multiplication and check for the sign (horizontal lines with Y2=Y1 do not count in the algorithm)

要避免任何数与 0 相除或溢出，将所有除法转换为乘法并检查运算符号（Y2=Y1 的水平线不会计入算法）

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66000 is chosen to check for integral overflow on small integer machines.

这里的66000代表机器的整型溢出的上限值，根据不同机器字长进行设定。

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