Java does not print decimal places [duplicate]

Question

I'm trying to do a very basic operation as follows:

double a=21/5;
System.out.println(a);

However, each time I get 4.0 as the output and not 4.2. I'm encountering this for the first time. I've been using Java for years, but never came across this obscurity.

Answer 1

You are using integer division, which result will always be integer You should use something like this.

double a=(double)21/5;