# How to round negative numbers

Negative Numbers to Zero

While rounding negative numbers the rounding is done downwards, that is negative numbers are rounded down. If a number such as needs to be rounded then the result will be -2 because is. This advantage holds true for negative numbers with the "round away from zero" rule. X will always round to regardless of X. This works with the "round down" and "round towards zero" rule for negative numbers, but not any other rule. "Round away from zero" is the only rule that has this benefit for both positive and negative numbers.

Join Stack Overflow to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search. We have come across a problem with Math. The problem is that this function doesn't round correctly for negative numbers. For example :. And this is not correct according to arithmetic rounding. The correct numbers for Apply Math. Where you can use Math. How about purely evaluating the result without using the math library? The 0 is just a silly trick in js that "overloads" the binary operator you could use any binary operator in order to truncate the number.

Note that this is not flooring like Math. One could even do something similar to Balan's answer I like that one and the one below, but I feel like this or the ternary operator will just be a touch faster--I am probably wrong, though, because the Math libraries have been proven to be very fast :. Rounding with precision. Rounds to Int by default or, if second argument is provided, to n digits after decimal point.

Then realize that parseInt how to get rid of tan lines naturally is similar to Math. So the parseInt v behavior is what you want, but instead of flooring, you want rounding. So the solution is this function :. Where Math.

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Rounding of negative numbers in Javascript Ask Question. Asked 4 years, 3 months ago. Active 8 months ago. Viewed 9k times. For example : 1. Is there any standard way, to correctly round negative numbers in Javascript? Improve this question. L Jan 11 '17 at Add a comment. Active Oldest Votes. Improve how to round negative numbers answer. Nina Scholz Nina Scholz k 20 20 gold badges silver badges bronze badges. In terms of performance, this should run at least as fast, or even faster.

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Firstly, what is "Rounding" ?

Jun 12,  · A video to show how to properly round negative numbers to the nearest integer in JAVA. For more help with JAVA concepts, visit lovedatingfind.com Well you are in luck because that is rounding towards or away from zero: Round Half Away From 0. For this method, rounds the number so it is further away from zero, like this: rounds away to 8; rounds away to 8; rounds to rounds to rounds away to rounds away to -8; Round Half Towards 0. Or we can have round the number closer to zero, like this: rounds away to 8; rounds . You could try using lovedatingfind.com(num) to round num and then - 1 if num was negative, e.g. if (num num = lovedatingfind.com(num) - 1; } else { num = lovedatingfind.com(num); } Share.

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Everything seems perfectly clear for positive numbers. Here is for example what I found on math. Rule One Determine what your rounding digit is and look to the right side of it.

Rule Two Determine what your rounding digit is and look to the right side of it. In that case, some kind of tie-breaking rule must be used. Wikipedia currently lists six deterministic tie-breaking rules in more or less common use:.

It's also the default rounding rule for IEEE floating-point arithmetic as used by most modern computers. According to that rule,. Out of the six methods described in Ilmari's answer, one has two noticeable advantages: the "round away from zero" rule. When faced with e. If X is zero then the rule tells us to round to 0. This also applies with the "round up" rule, but only for positive numbers. Any of the other rules could require us to examine X to determine whether or not we should round to 0.

This advantage holds true for negative numbers with the "round away from zero" rule. This works with the "round down" and "round towards zero" rule for negative numbers, but not any other rule.

With the "round away from zero" rule, half of all numbers will be rounded up and half rounded down when the digit 5 is encountered. This means that for a random selection of numbers that you round to the same place, the exepcted average amount that you will round by is 0. This is because every digit that you round down is paired with a digit that you will round up amount rounded in brackets :.

This advantage exists with some of the other rules, but with the others you lose the first advantage. Note that this only works if you expect to encounter positive and negative numbers with equal probability.

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Create a free Team What is Teams? Learn more. Rules for rounding positive and negative numbers Ask Question. Asked 10 years, 8 months ago. Active 3 years, 6 months ago. Viewed 60k times. But what about negative numbers? Do I apply the same rules as above? Improve this question.

McMuffinDK 2 2 bronze badges. Do you mean I guess the rules are application-dependent! If there is a technical circumstance where a specific rounding method is needed it should be clear that this is the case.

Add a comment. Active Oldest Votes. Improve this answer. Ilmari Karonen Ilmari Karonen Apparently, most of these have since been deleted, although some still remain. Also, the note at the end about my personal preference for "round to even" is just an addendum; the "meat" of the answer is in the first paragraph and the following list. I suppose I could add some examples for the other tie-breaking methods, too. We only need to look at a single place to determine which direction to round to.

Lack of bias With the "round away from zero" rule, half of all numbers will be rounded up and half rounded down when the digit 5 is encountered. JBentley JBentley 1 1 gold badge 3 3 silver badges 9 9 bronze badges. It also avoids bias when you have an equal mix of positives and negatives, of course. Sign up or log in Sign up using Google.

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## 5 thoughts on “How to round negative numbers”

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