How to Precisely Round Decimal Ratings to the Nearest 0.5 Increment?

How to Achieve Precise Decimal Rounding in Increments of 0.5 for Rating Display

When displaying ratings, it's often necessary to round the values to specific increments to achieve a desired level of granularity. One common requirement is to round to the nearest 0.5, as exemplified in the provided table.

To achieve this rounding behavior, a straightforward mathematical approach can be employed:

Step 1: Multiply by 2
Multiply the input rating by 2, effectively doubling its value.

Step 2: Round Using MidpointRounding.AwayFromZero
Round the doubled value using the Math.Round() method with the MidpointRounding.AwayFromZero parameter. This ensures that values exactly halfway between the 0.5 increments are rounded up to the nearest increment.

Step 3: Divide by 2
Finally, divide the rounded value by 2 to restore the original rating scale.

By following these steps, you can precisely round decimal values to the nearest 0.5 increment, facilitating the accurate and consistent display of ratings.

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