Question

How to round a number to a multiple of 8 in C#

Answer 1

using System;

public class Program
{
	private static int roundToMultipleOf(int number, int roundTo) {
		return (number + (roundTo - 1)) & ~(roundTo - 1);
	}

	public static void Main(string[] args)
	{
		Console.WriteLine(roundToMultipleOf(9, 8));
		Console.WriteLine(roundToMultipleOf(19, 8));
		Console.WriteLine(roundToMultipleOf(71, 8));
	}
}

 
 
 
/*
run:
    
16
24
72
    
*/

 

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Answer 2

using System;

public class Program
{
	public static double roundToMultipleOf(double number, double multipleOf) {
		return multipleOf * (long)Math.Round(number / multipleOf, MidpointRounding.AwayFromZero);
	}

	public static void Main(string[] args)
	{
		Console.WriteLine(roundToMultipleOf(9, 8));
		Console.WriteLine(roundToMultipleOf(19, 8));
		Console.WriteLine(roundToMultipleOf(71, 8));
	}
}

 
 
 
/*
run:
    
8
16
72
    
*/

 

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