In lab for Week 1, can someone explain why the evaluation y+x (-10 + 10) is not 0?
If the library was doing integer arithmetic, it would be zero. So they must be doing floating point here. Note that the answer is very close to zero: it is 0.0000…(a total of 124 zeros)…2.
Everything is an approximation in floating point. You can’t even exactly represent something as simple as \frac{1}{3}.
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