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Fix examples for multiplication and division#2

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Fix examples for multiplication and division#2
jlnr wants to merge 1 commit intojtwig:masterfrom
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@jlnr jlnr commented Dec 11, 2017

I've avoided using 2.x ** 2.x == 4.x in the examples because readers might mistake ** for exponentiation. 2 ** 2 == 4 happens to be true in many programming languages, but for other reasons.

And I think it is clearer now that ** and // truncate the operands, not the result. This is different from e.g. Pascal's div operator for integer division.

I've also avoided using 2.x ** 2.x == 4.x in an example because readers might mistake `**` for exponentiation -- `2 ** 2 == 4` happens to be true in most languages, but for other reasons.
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