The question asked: 17: If we have variables var1 = 0.1 var2 = 0.2 and we want to compare their sum with var3 = 0.3, which of the following is the correct way to do it?
The answer was 2 but when reading up about floating arithmetic I thought it was 3. Can anyone guide me through this?
Go into your python editor:
print(round(var1 + var2, 10) == round(var3, 1))
Returns True
print(round(var1,1) + round(var2, 1 ) == round(var3,1))
Returns False
You are correct.
Note that as of python 3.5, as per this answer , math.isclose
is the practical way to compare floats.
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