Double Number comparison

Правка en1, от question_id, 2015-08-23 20:26:09

Hi! I've seen many codes where 1e-11 (like this) is used to compare two double numbers. Why we use this? what it we do not use this?

Thanks in advance.

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en1 Английский question_id 2015-08-23 20:26:09 181 Initial revision (published)