On 2018-08-28 15:11, Frank Millman wrote:
Hi all
I know about this gotcha -
x = 1.1 + 2.2
x
3.3000000000000003
According to the docs, the reason is that "numbers like 1.1 and 2.2 do not
have exact representations in binary floating point."
So when I do this -
y = 3.3
y
3.3
what exactly is happening? What is 'y' at this point?
Or if I do this -
z = (1.1 + 2.2) * 10 / 10
z
3.3
What makes it different from the first example?
There's a bit of rounding going on in the last few digits. For example:
>>> 1.1
1.1
>>> _ - 1
0.10000000000000009
>>> 0.1
0.1
>>> _ * 10 - 1
0.0
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