c# - Round up to next quarter

Question

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...

Answer 1

You can use:

Math.Ceiling(num * 4) / 4.0;