CODEWITHSUNDEEP
mathpython-3.2
sinekonata
sinekonata

Reputation: 374

python integer approximation

In python the function math.log(1000, 10) returns
2.9999999998 or some approximate value (neraly every third integer does that)

Which firstly is kind of messed up even though I imagine there's not much (except divisibility tests) to do about it.
And secondly it's not the value I want of course, how should I proceed? Casting to int will clearly return 2 and not 3... So what method is used to get the round to nearest int? In this case and in general, please.

Upvotes: 3

Views: 839

Answers (1)

sinekonata
sinekonata

Reputation: 374

Someone removed his/her answer before I could accept it, so I write mine which is no more than a summary.

Two options that I liked:

In this particular case, since the operation was math.log(1000, 10), it could be replaced with math.log10(1000) which shows much greater precision.

In a more general case, round(math.log(1000, 10)) will round 2.999... to the integer 3 so this would be more what was asked.

Upvotes: 1

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