Modulo and Division confusion 
11 Jan 2009, 00:50
Gareth (3 posts) 
Hi. On page 18 I didn’t understand what “takes the floor of the result…” meant. I really think this could be better explained. Please tell me if this forum is not for feedback. Thanks. G.

23 Jan 2009, 04:02
Paul Archer (2 posts) 
It’s a math term, but basically just means you get the lower whole number. In their example, 17 / 10 yields 2. 17/10 is actually 1.7, but it goes to the nearest lower whole number, which is 2. The reason they mention this is that it’s common to think of it as going to the smaller whole number, which would be 1. 
28 Jan 2009, 03:55
Gareth (3 posts) 
Cheers. I’ve started reading a maths primer. Can’t wait for this book to get completed. 
14 Jun 2012, 14:40
Shawn Bowne (1 post) 
I’m having trouble understanding 17 % 10 being equal to 3. How does the modulo work with negative numbers? 
16 Jun 2012, 01:56
Paul Gries (44 posts) 
That’s a great question, and it confuses a lot of people. Guido van Rossum, the inventor of Python, actually wrote a blog post about Why Python’s Integer Division Floors:
Note that in that article Guido is using Python 3.0, and the integer division operator changed between versions 2 and 3, from a single forward slash (/) to a double slash (//). Does that article explain it well enough? 
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