![]() ![]() What you'd get back would be inaccurate.Īctually, the number of binary places for float and double values are fixed by their respective format definitions, not definable by the application programmer. The IEEE floating-point format that Java uses has binary fractions, not decimal ones, so it would be impossible to return a "double with 2 decimal places" for the same reason that you can't return 1/3 to 2 decimal places. Of course, there's a fundamental problem with that. The correct question would have been "how to return double with 2 decimal places. That's the delineation (point) between the integral part of the number and the fractional part. However, it is just possible that you need an exact value to 2 decimal places - for example, to hold an amount of money in dollars - and if that's the case then you have no alternative but to use BigDecimal (as you already did) and forget about doubles altogether.īut whatever you do, don't, don't, DON'T change the return type to a String just because it doesn't look right.įloating point numbers have only ONE decimal point. To get the formatted String, and then just print that. If you want to display a double rounded to two decimal points, then use: You seem to be hung up on this notion of 2 decimal places, when in fact it's just a formatting issue. I had to redesign the function to return string instead of double. ![]() So there is no such thing as a "double with two decimal points". Ramy Nady wrote:I have tried BigDecimal with setScale, the BigDecimal itself has the two digits but whenever I convert it to double still keeping one digitĪ double (or Double) has no notion of how many "decimal points" it holds it's simply a value - and often an inexact one at that (read this). I hope I haven't muddled things I am saying that if the input was already limited to two digits of precision, and is less than roughly 10^14, your original solution is already working and you just may be misled by what () displays. You may think you're incorrectly returning "10.0" because that's what you see when you convert it to a String and display it on the console. You can return that, and you will have met the requirements of the problem as described. "10.00" (String) successfully parses to a double representing 1 x 10^1. However, if your function needs to return a double, as you have shown in your follow-up posting, then maybe I need to better understand the problem. If your function needs to have a fixed precision (2 digits in this case) BigDecimal is the way to go for parsing the String. I agree with Jeanne and just want to expand on her advice. STEP 3 − The last or the third step will display the result on the user screenJeanne Boyarsky wrote:The problem is that double doesn't support a fixed number of decimal points.var fixedNum = Math.round(number*100)/100. STEP 2 − Now we compute Math.round() and assign it to a new variable fixedNum, i.e.STEP 1 − As a first step, we will create a variable named “ number” and assign a value to it.In the above syntax Math.round() is the method of formatting a number and num is the number to be formatted with two decimals. Syntaxįollowing is the syntax for rounding off a given number in JavaScript − Math.round(num*100)/100 We will use the method to format a number with two decimals. The Math.round() method returns the given numeric expression rounded to its nearest number. In the above program, we have used the number.toFixed(2) rounds a number to the number with two decimal positions. The example below will illustrate numbers before and after formatting in JavaScript. STEP 3 − Display the result on the user screen.The result is formatted with two decimals. STEP 1 − Declare a variable named “ num” and assign a number to the variable.In the above syntax toFixed() is the method of formatting a number with twoIn the above syntax toFixed() is the method of formatting a number with two decimals in JavaScript and number is the number to be formatted with two decimals. Syntaxįollowing is the syntax format for a number up to 2 decimals using the toFixed() method − number.toFixed(2) it returns a string representation of the number that does not use exponential notation and has the exact number of digits after the decimal place. The toFixed() method formats a number with a specific number of digits to the right of the decimal. In JavaScript, we can apply many methods to perform the formatting. Formatting a number means rounding the number up to a specified decimal place. ![]() This tutorial will teach us how to format a number with two decimals using JavaScript. ![]()
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