# [Tutor] Rounding up/down integer numbers!

Gregor Lingl glingl@aon.at
Fri Aug 1 05:01:05 2003

```Wilhelmsen Jan schrieb:

> Hi!
>
>
>
> I have the need to round up some numbers to the nearest 100. (01-49
> down and 50-99 round up)
>
>
>
> How do you do this most efficiently?
>
>
>
Python has a function round, which returns numbers of type double:

>>> print round(1123.456789, 4)
1123.4568
>>> print round(1123.456789, 2)
1123.46
>>> print round(1123.456789, 0)
1123.0

This function has a wonderful magic property:

>>> print round(1123.456789, -1)
1120.0
>>> print round(1123.456789, -2)
1100.0

If you need an integer as a result use int to convert type:

>>> print int(round(1123.456789, -2))
1100
>>> print int(round(8359980, -2))
8360000

HTH, Gregor

> Ex:
>
>
>
> 8356440
>
> Should be rounded down to:
>
> 8356400
>
> and:
>
> 8356499
>
> should be rounded up to:
>
> 8356500
>
>
>
> So far I managed but what if:
>
>
>
> 8359980
>
> Then the number should be rounded up to:
>
> 8360000
>
>
>
> Can anyone give me a clue to this?
>
>
>
> I think maybe I have to set up a range with split 100 and use a while
> syntax
>
>
>
> But I'm pretty new to programming so I'm not sure how to do this
>
>
>
>
>
> Thanks
>
>
>
> Regards
>
>
>
> Jan Wilhelmsen
>
> IT-Technician
>
> Bilia Personbil as
>
>
>
>
>
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```