Calculationg the percentage.

I am trying to calculate a percentage.

Code :

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double percentage = (numberMatchedEntries / numberEntriesFile1) * 100;

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numberMatchedEntries = 20
numberEntriesFile1 = 52

So the output would be about: 38.1%

But from this code:
(numberMatchedEntries / numberEntriesFile1)
I only get 0 back, and not 0,381

I tried using a float too, but it still keeps 0.
And I realy don't know why?

What data types are used in the formula? With integer arithmetic: 6/10= 0
using doubles: 6.0/10 = 0.6

That would be it.
Those two are int's.
I will change that.

Thanks.