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Why modulo (%) active with float:
V 2.0.3 Windows 7
println(4%3);
println(4.5%3);
println(4.0%3.0);
println(3.5%4.0);
//--------
Output
1
1.5
1.0
3.5
Answers
So what's the problem? Those are the values you should get.
Java natively supports modulus for float and double, http://mindprod.com/jgloss/modulus.html and see this from doc http://www.processing.org/reference/modulo.html, beware negative modulus in java it is very strange.
Thank