How Can I Round Floating-Point Numbers to the Nearest Half-Increment?

Rounding Floating-Point Values to the Nearest Half-Point Increment

When displaying ratings, precise increments are often preferred to maintain clarity and understandability. In this particular scenario, input values are rounded to the nearest 0.5 increment, following a specific pattern.

To achieve this, a simple mathematical operation can be applied:

1. Multiply the input rating by 2. This effectively shifts the decimal point one place to the right.
2. Round the multiplied value using the Math.Round() function with MidpointRounding.AwayFromZero. This rounds the value to the nearest integer, ensuring that the resulting value is closer to the actual input rating.
3. Divide the rounded value by 2. This restores the decimal point to its original position, providing a value rounded to the nearest 0.5 increment.

Below is the formula to perform this operation in code:

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

This method allows for efficient and precise rounding of input ratings, supporting the desired display format with increments of 0.5.

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