Java arithmetics for calculating a percentage

Question

I have a little problem in my java application.

I have to calculate the score they have when they finish, I use this method:

public Float ScoreProcent(in         


        

Answer 1

Try this:

num = (float) (100 * (float) correct / (float) questions);

or

num = (correct * 100.0) / questions;

Answer 2

There are no unreasonable quesions.

You are calculating what fraction of correct are there among the questions. The mathematical way of saying this is:

  correct/questions

Now, since they can go onto decimals you need to use that Floats you mentioned in your code. So:

 (float)correct/(float)quesions  

That is how you cast something to float. To get the answer in percentage(in 100) it must be multiplied by 100 which is

  100 * (float)correct/(float)quesions 

And there you go :)

For proper way to get it coded listen to other answers.