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weird rounding or calculation error for a simple formula
posted

I have a calculated column in a grid, the formula is simple: D = A - B  - C  

(D being the calculated column)

When the result should add up to zero, I get instead something like this: -2.8421709430404E-14

Is this a bug in the calc manager?

For example these numbers: 217.28 - 37.08 - 180.2 should return 0 but instead return the small scientific number above

EDIT: I am using version 2013.1