How do I round to the nearest 0.5?

c# math function
Murtaza Mandvi picture Murtaza Mandvi · Aug 25, 2009 · Viewed 123k times · Source

I have to display ratings and for that i need increments as follows:

If the number is 1.0 it should be equal to 1
If the number is 1.1 should be equal to 1
If the number is 1.2 should be equal to 1
If the number is 1.3 should be equal to 1.5
If the number is 1.4 should be equal to 1.5
If the number is 1.5 should be equal to 1.5
If the number is 1.6 should be equal to 1.5
If the number is 1.7 should be equal to 1.5
If the number is 1.8 should be equal to 2.0
If the number is 1.9 should be equal to 2.0
If the number is 2.0 should be equal to 2.0
If the number is 2.1 should be equal to 2.0
and so on...

Is there a simple way to compute the required values?

Answer

John Rasch picture John Rasch · Aug 25, 2009

Multiply your rating by 2, then round using Math.Round(rating, MidpointRounding.AwayFromZero), then divide that value by 2.

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

Related questions

How can I calculate divide and modulo for integers in C#?

How can I calculate division and modulo for integer numbers in C#?

Read More
How to check if a number is a power of 2

Today I needed a simple algorithm for checking if a number is a power of 2. The algorithm needs to be: Simple Correct for any ulong value. I came up with this simple algorithm: private bool IsPowerOfTwo(ulong number) { if (number == 0) …

Read More
How can I divide two integers to get a double?

How do I divide two integers to get a double?

Read More