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12.95 - 12 = .949999999999999 - FREAKY!

John Wallace
in The Left Brain

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OK - this is starting to bother me. Is 12.95 minus 12 really .949999999999999? Can anyone explain what is going on here?

Try it for yourself. Create a number field (NumField) and put 12.95 in it. Then create a calculation that subtracts 12 from the NumField. What's the result? .949999999999999? Huh?

NumFormat.zip

Floating-point math, its actually done in base-2 (binary) not base ten (decimal), so the result doesn't always make sense back in the real world.

FM7 fixes this, math is done in base-10.

An interesting fact, 1/10 is infinitely repeating in binary form, since it cannot be cleanly represented as:

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https://fmforums.com/topic/24335-1295-12-949999999999999-freaky/
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