When Rounding Half Float Numbers, How Does Bankers Rounding Affect Precision?

Rounding Half Float Numbers: A Mystery Solved

This article explores the unexpected behavior of the round() function when dealing with half float numbers. This behavior, where numbers are rounded to the nearest even number rather than always rounded up, is rooted in a rounding strategy known as "bankers rounding." This technique aims to minimize rounding errors by rounding half values to the nearest even number.

Moving beyond the default behavior, the article introduces the decimal module, which provides finer control over rounding strategies. By utilizing the ROUND_HALF_UP constant, it demonstrates how to round half float numbers correctly, ensuring an expected round-up operation.

The provided code showcases the difference between bankers rounding and round-up rounding, highlighting the versatility of the decimal module in addressing specific rounding requirements.

For further exploration, the documentation covers the specific details of the round() function, explaining the half to even rounding behavior in depth.

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