Why doesn't this code do what I want it to do

Question

Note:I am a bit of a beginner so be careful of your comments

Why doesn't this code output not a multiple of one point nine only when the input is not a multiple of nine

import java.util.Scanner; class code
{
public static void main(String[] args) {Scanner sc = new Scanner(System.in);
double name = sc.nextDouble();

if(name%1.9!=0){System.out.println("not a multiple of one point nine");}else{System.out.println(" multiple of one point nine");}}
}

Answer 1

daniel
I have attached a working concept of your code.

It is easier to debug & understand when presented in the playground.

Sometimes copy/paste into Q&A can cause unintended bugs.

PS: it is Java, not JS as JaScript has informed you

https://code.sololearn.com/cJ1K3rSCgMto/?ref=app

Answer 2

By the way this is a Java code not JavaScript as in your tag.

Answer 3

Daniel, that is inaccuracy of a digital numbers calculation. You could that see what happend in this way:

System.out.printf("%.19f\n",name%1.9);

Answer 4

I just thought java was short for javascript

Answer 5

Also Rik I put in there 20.9 and as it didn't work in my code it responded not a multiple of one point nine when1.9×11=20.9 Sorry for making it a year1-3maths class