Question

How to round a number to a multiple of 8 in Java

Answer 1

public class Program {
    private static int roundToMultipleOf(int number, int roundTo) {
    	return (number + (roundTo - 1)) & ~(roundTo - 1);
    }
    
    public static void main(String args[]) {
        System.out.println(roundToMultipleOf(9, 8));
        System.out.println(roundToMultipleOf(19, 8));
        System.out.println(roundToMultipleOf(71, 8));
    }
}

   
   
/*
run:
   
16
24
72
   
*/

 

 

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Answer 2

import java.lang.Math;

public class Program {
    public static double roundToMultipleOf(double number, double multipleOf) {
        return multipleOf * Math.round(number / multipleOf);
    }

    public static void main(String[] args) {
        System.out.println(roundToMultipleOf(9, 8));
        System.out.println(roundToMultipleOf(19, 8));
        System.out.println(roundToMultipleOf(71, 8));
    }
}


   
   
/*
run:
   
8.0
16.0
72.0
   
*/

 

 

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