juantamad
Designing Elixir Systems Book Question
On page 23 of the book Designing Elixir Systems With Otp it says “Use div() and rem() to get integer division rather than /.”. For 7/6 gives 1.1666666666666667. How is div and rem better than 7/6?
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mbuhot
“Integer division” may be referring to the behaviour of languages like C that do a truncating division on integers.
div / rem are just the way to get that result on the beam.
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JEG2
In the paragraph above your quote, we say, “… prefer integers or decimals over floats when you can.” This advice is based on the inaccuracy of floating-point arithmetic. If you want to follow our advice you need to avoid this problem:
iex(1)> 3 / 1
3.0
div/2 is how you do that.
NobbZ
It’s not about better or worse, it’s about “for integer division use div/rem, rather than / as the latter simply doesn’t do integer division but always returns a floating point number.”
NobbZ
It doesn’t say anything about using div/rem for floating point arithmetic, at least not in the portion you cite. There it just says that you can not use / for integer division…
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juantamad
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