How do you round UP a number?

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Chapters
00:00 How Do You Round Up A Number?
00:24 Accepted Answer Score 1329
00:43 Answer 2 Score 181
01:11 Answer 3 Score 92
01:38 Answer 4 Score 334
02:00 Thank you

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Full question
https://stackoverflow.com/questions/2356...

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Content licensed under CC BY-SA
https://meta.stackexchange.com/help/lice...

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Tags
#python #floatingpoint #integer #rounding

#avk47

ACCEPTED ANSWER

Score 1329

The math.ceil (ceiling) function returns the smallest integer higher or equal to x.

For Python 3:

import math
print(math.ceil(4.2))

For Python 2:

import math
print(int(math.ceil(4.2)))

ANSWER 2

Score 334

I know this answer is for a question from a while back, but if you don't want to import math and you just want to round up, this works for me.

>>> int(21 / 5)
4
>>> int(21 / 5) + (21 % 5 > 0)
5

The first part becomes 4 and the second part evaluates to "True" if there is a remainder, which in addition True = 1; False = 0. So if there is no remainder, then it stays the same integer, but if there is a remainder it adds 1.

ANSWER 3

Score 181

Interesting Python 2.x issue to keep in mind:

>>> import math
>>> math.ceil(4500/1000)
4.0
>>> math.ceil(4500/1000.0)
5.0

The problem is that dividing two ints in python produces another int and that's truncated before the ceiling call. You have to make one value a float (or cast) to get a correct result.

In javascript, the exact same code produces a different result:

console.log(Math.ceil(4500/1000));
5