neighbors are equidistant, in which case round up.So knowing this, we realized that we won't be getting an exact rounding, unless we want to round towards This will end up giving us the expected output, which would be Keep in mind that String.format() and DecimalFormat produce string using default Locale. Please help. If the number argument is a positive or negative number, the Math.round function will return the nearest value.
The number of zeros indicate the number of decimals.As some others have noted, the correct answer is to use either I am posting the following code as a counter-example to all the answers in this thread and indeed all over StackOverflow (and elsewhere) that recommend multiplication followed by truncation followed by division.
0 votes. Featured on Meta How to round a double to 2 decimal places? Due to the nature or floats and doubles there are borderlines cases when it does not work properly (more information here double is a fast! example).Just in case someone still needs help with this.
Very simple and you are basically updating the variable instead of just display purposes which DecimalFormat does. @hamish The question is about precision, not about speed.Please include your reason for downvoting in the comment, otherwise that's what we call intimidation.Do you have metrics showing how efficient is your solution compared to the other ones?I haven't compared it with other solutions but there is a jmh benchmark available in the source code: DoubleRounder fails for following cases: DoubleRounder.round(256.025d, 2) - expected: 256.03, actual: 256.02 or for DoubleRounder.round(260.775d, 2) - expected: 260.78, actual: 260.77. The basic syntax of the round Function in Java Programming language is as shown below.
But uninformatively float and doubles are approximations. If you get paid by the clock cycle, this is what you should be doing. if it was, then you would be using 3dp then converting it to decimal, then doing a decimal round function, just like the link you posted. The toFixed() method converts a number into a string, rounding to a specified number of decimals.
So they may write formatted number with dot or comma as a separator between integer and decimal parts. You lost precision as such Math.round round it as 100. if the decimal to be rounded is 5, it always rounds up to the next number. One comment tho, don't use the HALF_EVEN rounding mode since it has diff behavior for odd and even numbers (2.5 rounds to 2 while 5.5 rounds to 6, for example), unless this is what you want.The first solution is correct: the second one doesn't work. Where developers & technologists share private knowledge with coworkersProgramming & related technical career opportunitiesHi, I thought I've found a perfect solution to my current problen in your post. Questions: This question already has an answer here: Round to at most 2 decimal places (only if necessary) 42 answers Answers: NOTE – See Edit 4 if 3 digit precision is important var discount = (price / listprice).toFixed(2); toFixed will round up or down for you depending on the values beyond 2 … See EJP's answer here at @SebastiaanvandenBroek: Wow I never knew it was that easy to get a wrong answer. There are a couple of ways to achieve the rounding. Not that rounding does causes a problem. Both are methods that Java provides. I don't understand how this would fail.it is ok Matt, your example is not valid. If you have a list of numbers with 3 decimal places, you want them to all have the same digits even if it's 0.The trick is that in all of your 9251 errors, the printed result is still correct. In the example below, variable pp value has 5 zeros, so 5 digits will be displayed.I came here just wanting a simple answer on how to round a number. because 1.005 can not be represented in floating point double anyway. 0.99 It goes to the Any decimal value is rounded down to the next integer. program. Stack Overflow for Teams is a private, secure spot for you and
To alter the accuracy / precision of a result output simply DecimalFormat took 14ms to complete the 200 loops, this method took less than 1ms. your coworkers to find and share information.
Rounding in Java: Two Options.
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