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c# - Round up to next quarter

I would like to round a number up to the next quarter (i.e. 2.1 rounds to 2.25). I understand that I can get the nearest quarter by using Math.Round(num * 4) / 4, but I would like to expand on this so that it always rounds up to the next quarter.

So far my only solutions involve using if blocks, but I would like to exhaust the one-liner algorithm approach first to try to keep things simple.

This is technically language independent, but in this case I am using C#.

To be clear, below are examples of what I want:

  • 2.0 stays as 2.0
  • 2.01 - 2.24 round up to 2.25
  • 2.25 stays as 2.25
  • 2.26 - 2.49 round up to 2.5
  • and so on...
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You can use:

Math.Ceiling(num * 4) / 4.0;

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