When I do division in Java, I lose my decimal, how to show it?

Question

when I do this

    double money = 2.3452;
    DecimalFormat decFor = new DecimalFormat("0.00");
    System.out.println(decFor.format(money));

I get this output: 2.35

But when I do this

    double money = 1/8;
    DecimalFormat decFor = new DecimalFormat("0.00");
    System.out.println(decFor.format(money));

I get: 0.00

How to make Java to show you 0.12 instead of 0.00?

Answer 1

Do this:

double money = 1.0 / 8;

The problem is that you are taking the integer, 1 and dividing it by an integer, 8. Java then uses integer math, which truncates to 0. If you use 1.0 explicitly, then it will use floating point division.

Answer 2

You need to cast to double. In integer division the fractional part of the result is thrown away.

double money = (double)1/8;
DecimalFormat decFor = new DecimalFormat("0.00");
System.out.println(decFor.format(money));