Java double precision sum trouble

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If you wanted 2.97, you should have used BigDecimal.

doubles are stored as fractions in binary, not decimal. So 3.75, for example, is just stored as 2^1 + 2^0 + 2^(-1) + 2^(-2).

2.8 and 0.17 cannot be represented exactly as binary fractions, so there’s going to be some rounding error.

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