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並前往https://www.quora.com/Why-do-we-round-off-0-5-to-1-and-not-to-0

Why do we round off 0.5 to 1 and not to 0? - Quora

The IEEE 754 floating point standard, found in virtually every computer since 1980, has 4 rounding modes : 1. Always round up 2. Always round down 3.

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