[YES i failed]

Ok so im trying to print to the screen how long it takes for a method to execute.
i have something like this

long start = System.nanoTime();//computation begins
       //execute method
long end = System.nanoTime();//computation ends
long time = end-start;
System.out.println(time + " nanoseconds");

example output

1809342 nanoseconds

how can i make the number display as

1.809342 milliseconds

i tried this

long time = (end-start)/1000000L;

but it rounds off to 1 digit and no decimal places.
and yes i have tried System.currentTimeMillis(); - it displays one digit as well with no decimal places.

This post has been edited by YES i failed: 04 November 2010 - 05:44 PM

[macosxnerd101]

You are experiencing integer division. When you divide two integer values (long, int, short, byte), the result is an integer, meaning the decmial places are truncated. Try using a double instead, and make sure the denominator is a double as well as the variable.

[Dogstopper]

Yep, integer division is killer. If you do this instead:

double time = (end-start)/1000000.0; // The .0 makes it a double by default.

[YES i failed]

worked perfectly guys thanks so much!