Double decimal values

Question

long startTime = System.currentTimeMillis();
float resultTime= (System.currentTimeMillis() - startTime) / 1000;
System.out.println("Result time : " + resultTime);

The result is always a rounded value like 1.0 or 2.0. How can I obtain an exact result like 1.234?

possible duplicate of [Java float division precision](http://stackoverflow.com/questions/7286681/java-float-division-precision) — Brian Roach, Dec 26 '11 at 23:04

Mysticial · Accepted Answer · 2011-12-26T23:10:06.843

4

You're doing integer division. (which rounds down to an integer)

Cast to float before you do the division:

float resultTime= (float)(System.currentTimeMillis() - startTime) / 1000.0f;

edited Dec 26 '11 at 23:10

answered Dec 26 '11 at 23:02

Mysticial

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That should be ...` / 1000.0f` should it not? It's the denominator that determines the return value. – James Webster Dec 26 '11 at 23:03
Doing `System.currentTimeMillis() - startTime / 1000.0f` would probably be less ugly. – Dec 26 '11 at 23:04

score 2 · Answer 2 · answered Dec 26 '11 at 23:03

2

Instead of dividing by 1000, divide by 1000.0. That way instead of doing integer division, you do floating point division.

answered Dec 26 '11 at 23:03

Dan

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Double decimal values

2 Answers2