simple math operation for a progress bar

[Alonso Tapia]

I'm currenlty delevoping a progress bar for an application with a fixed number of iterations. I have an event listener that monitors the process so I know the current cicle of the process. My problem is when I try to calculate the percentage of the current cicle, relative to the total number of cicles. This is my code:

    public void cicleTerminated(NeuralNetEvent e) {
        mon = (Monitor)e.getSource();
        int epoca = mon.getTotCicles() - mon.getCurrentCicle();
        int ciclos = mon.getTotCicles();

        int epoca_per = epoca / ciclos * 100;
        jProgressBar1.setValue(epoca_per);
    }

Fisrt, maybe mention that mon.getCurrentCicle() actually gets the cicles left rather than the current.

So, ciclos is a fixed number and epoca changes every cicle, but when I calculate the percenage with epoca_per it gets stuck at 0.
It's a very simple operation and I've confirmed that epoca actually changes, but I have no clue why epoca_per doesn't change.

[Campbell Ritchie]

Try 100 * epoca / ciclos. The value of epoca must never rise above 21474836 if it is an int.

Why? You are doing integer division: 9999 / 10000 returns 0. If you want to get 99% from 9999 / 10000, you will have to try 100 * 9999 / 10000, which is evaluated as 999900 / 10000, which comes to 99.

[Alonso Tapia]

ohh so simple..
thanks!!

[Benjamin Thvedt]

Integer division has been messing me up too...I didn't know you can multiply it by another int to get an anwser, I have just been using all doubles up until now!