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It can produce harsh shadows
Overflow occurs when the magnitude of a number exceeds the range allowed by the size of the bit field. The sum of two identically-signed numbers may very well exceed the range of the bit field of those two numbers, and so in this case overflow is a possibility.
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Getting it right will not only protect employees and visitors from harm, it will also help to create a safe, productive workplace and mean that businesses can avoid any unnecessary financial loss.