Going mad with the basics

I've got a method where I'm passing in an int number (numberOfDays).
I'm then doing the following:
double percentage;
percentage =2/(numberOfDays+1);
but percentage always equals 0.0.
If I do
percentage =2-numberOfDays;
then I get a number.
Am I going crazy or is there a reason for my division not working????

dont get Crazy.
that is java complier known Error.
double percentage =(double)2/(double)(numberOfDays+1);
the idea:
in java u cant say double = 2/ integer.
becuase i will get always 0.0
so u have to convert the integer into double and then get the operation

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Going mad with the basics

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