How to check if number is divisible by a certain number?

Question

I am using AndEngine to add sprites to the screen and come across using the movemodifier method.

I have two integers MaxDuration and MinDuration;

What i want to do is when the user gets to a score of a certain increment.

Like for example.. when the user gets to 20(the integer changes) when the user gets to 40(the integer changes). So basically count by 20 and every time the score meets a number divisible by 20 the integer's change. I hope this makes sense.

Is there any method or way to do this? I have an UpdateTime handler that can check the score just about every second.

Any ideas?

Juan Moreno · Accepted Answer · 2020-02-20 16:53:37Z

124

n % x == 0

Means that n can be divided by x. So... for instance, in your case:

boolean isDivisibleBy20 = number % 20 == 0;

Also, if you want to check whether a number is even or odd (whether it is divisible by 2 or not), you can use a bitwise operator:

boolean even = (number & 1) == 0; boolean odd = (number & 1) != 0;

edited Feb 20, 2020 at 16:53

Juan Moreno

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answered Nov 24, 2011 at 17:23

Cristian

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7 Comments

Phil Over a year ago

To add to this, this symbole (%) is known as the modulus operator, or mod for short. So this function can be read as n mod x equals 0.

coder_For_Life22 Over a year ago

So in this case if the score is 20 and it checks if it is divisible by 20 the answer will be 1. so it would be false? correct? so why is it ==0?

coder_For_Life22 Over a year ago

so if the remainder is 0. then it is true?

Rhand Over a year ago

mod is the remainder after the devision. So 20/20 = 1 and 20%20 = 0 (no remainder). 21%20 = 1

NickT Over a year ago

@coder_For_Life22 - You should note that 0 % 20 is also equal to 0, in case it makes a difference to your app.

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J. Born · Accepted Answer · 2017-02-15 00:29:43Z

package lecture3; import java.util.Scanner; public class divisibleBy2and5 { public static void main(String[] args) { // TODO Auto-generated method stub System.out.println("Enter an integer number:"); Scanner input = new Scanner(System.in); int x; x = input.nextInt(); if (x % 2==0){ System.out.println("The integer number you entered is divisible by 2"); } else{ System.out.println("The integer number you entered is not divisible by 2"); if(x % 5==0){ System.out.println("The integer number you entered is divisible by 5"); } else{ System.out.println("The interger number you entered is not divisible by 5"); } } } }

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