Comment on If I hear "% is a mathematical operator" one more time...
bryndos@fedia.io 3 weeks ago
5 % 2 = 1
Freaking hell even ddg search gives that answer.
Comment on If I hear "% is a mathematical operator" one more time...
bryndos@fedia.io 3 weeks ago
5 % 2 = 1
Freaking hell even ddg search gives that answer.
moosetwin@lemmy.dbzer0.com 3 weeks ago
jeff@programming.dev 3 weeks ago
You are misunderstanding what the remainder is.
5 % 2 == 1, because 5 == 2 x 2 + 1
10 % 7 == 3, because 10 == 1 x 7 + 3
Your “edit 2” is mostly correct. I don’t think of it “undoing” the division. But if that makes sense to you then I guess it’s fine
chaos@beehaw.org 3 weeks ago
It’s not undoing the division, it never happens in the first place. Remainders aren’t ever fractions, that’s the whole point, they’re left over because they can’t be divided evenly. 5 % 2, you can take 2 away twice and you’ll have 1 left over which can’t have 2 taken away.
Rivalarrival@lemmy.today 3 weeks ago
Modulo is much easier to understand with clocks.
Suppose It is currently midnight. What time will it be in 3 hours? 3 mod 24 = 3. It will be 03:00
What time will it be in 27 hours? 27 mod 24 = 3. It will be 03:00 we go through a whole day (24 hours) to get back to midnight, then another 3 hours.
What time will it be 48 hours from now? 48 mod 24 = 0. 48 hours from midnight will be midnight.
What time will it be 6 hours from now? 6 mod 24 = 6.
Conceptually, X mod Y means that instead of 24 hours per day, we are splitting the day into Y “hours”, labeled 0 to Y-1. We start at 0, and pass through X “hours”. X mod Y is the “hour” we finish up in at the end. 5 mod 2 means we have a 2-hour day, with hours 0 and 1. We pass through 5 of those hours. When we finish, are we at hour 0 or hour 1?