Math.ceil returning 0.0?

Question

So I'm working on a Java project, and I type this:

double totalPages;
int amountKits = 2;
totalPages = amountKits / 3;
System.out.println("Total pages before ceil: " + totalPages);
totalPages = Math.ceil(totalPages);
System.out.println("Amount of Kits: " + amountKits);
System.out.println("Total Pages: " + totalPages);

And here is the result:

Total pages before ceil: 0.0
Amount of Kits: 2
Total Pages: 0.0

Does anyone know why this is happening? (Sorry, I'm a noob, I know)

Answer 1

Because you're calculating 2 / 3 in integer arithmetic.

Try:

totalPages = amountKits / 3.0;

instead.

Answer 2

2/3 is integer division that returns 0. This then gets converted to a floating point value, 0.0 when you assign to totalPages .

You need to perform floating point division, for example by writing amountKits/3.0 .