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The problem is that float numbers are seldom an exact representation. So the float is stored as the closest number that is exactly representable as a float, namely
10446438 × 2−18 = 39.84999847412109375.
When you multiply this by 100, you get 16322559 × 2−12 = 3984.999755859375.
And than casting to an int or long results in 3984, not 3985.
so whenever you ...
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