Simple division in Java - is this a bug or a feature?

java division
rasgo picture rasgo · May 26, 2010 · Viewed 188.6k times · Source

I'm trying this simple calculation in a Java application:

System.out.println("b=" + (1 - 7 / 10));

Obviously I expect the output to be b=0.3, but I actually get b=1 instead.

What?! Why does this happen?

If I write:

System.out.println("b=" + (1 - 0.7));

I get the right result, which is b=0.3.

What's going wrong here?

Answer

Xavier Ho picture Xavier Ho · May 26, 2010

You're using integer division.

Try 7.0/10 instead.

Related questions

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

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 …

Read More
How do I divide so I get a decimal value?

I want to know how to get remainder and quotient in single value in Java. Example: 3/2 I should get value as 1.5. If I use the / operator I get only the quotient. If I user the % operator I get only the …

Read More
Integer division in Java

This feels like a stupid question, but I can't find the answer anywhere in the Java documentation. If I declare two ints and then divide them, what exactly is happening? Are they converted to floats/doubles first, divided, then cast …

Read More