How Do I Round Ratings to the Nearest 0.5 Increment?

rounding to the Nearest 0.5

When displaying ratings, it's often necessary to represent them in increments of 0.5. To achieve this, a simple mathematical operation can be employed.

Multiply the rating by 2 and round it using Math.Round(rating, MidpointRounding.AwayFromZero) method, which rounds the number away from zero if the fractional part is exactly 0.5. Finally, divide the rounded value by 2 to obtain the desired result.

For example:

Math.Round(1.3 * 2, MidpointRounding.AwayFromZero) / 2

This will round 1.3 to 1.5.

Here's a table demonstrating the rounding behavior:

Input	Rounded
1.0	1
1.1	1
1.2	1
1.3	1.5
1.4	1.5
1.5	1.5
1.6	1.5
1.7	1.5
1.8	2.0
1.9	2.0
2.0	2.0
2.1	2.0

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