Error on floating point?
One can expect that 1.2 * 3.0 equals 3.60
But the following statement has the result: 3.5999999999999996
- System.out.println(1.2 * 3.0);
Why?
How can I control or estimate the floating point error?
Thanks in advance!
It is not a Java problem or a Java error. It is inherent to floating-point arithmetic.
1.2 can not be exactly represented in binary floating-point arithmetic. But 1.25 (that is 5 * (2 ^ -2)) can be.
If your problem requires exact decimal arithmetic, use BigDecimal instead. (It is very slow compared to the conventional floating-point arithmetic).
Please consult a textbook on numerical calculus for the techniques of dealing with floating-point error - it depends on the algorithm that you use for solving your problem.
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