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Yep. To round after k decimal places, use a scale factor of 10^k. This should be really easy to see if you write out some decimal values by hand and play around with multiples of Suppose you're working with the value , and want to round it to 3 decimal places. The operation available to you is round to integer. So, how do you move. The first thing you need to do is use the decimal type instead of float for the prices. Using float is absolutely unacceptable for that because it cannot accurately represent most decimal fractions. Once you have done that, speednicedating.com() can be used to round to 2 places.
The Excel file being used in a Word mail merge document is not maintaining the 2 decimal format in Excel. Even with the numbers set to 2 decimal places, and the worksheet set to Precision as Displayed, when I import the data into the mail merge document, it's displaying multiple decimal places.
The only way I can get it yow show only 2 decimals is by changing the format of the Excel data to text, which then causes me to lose the comma separator, which I would like to keep.
Is there additional formatting I need to do? In order now retain the two decimal places during how to make halloumi at home merge, follow the instructions below:.
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Jun 15, · The Excel file being used in a Word mail merge document is not maintaining the 2 decimal format in Excel. Even with the numbers set to 2 decimal places, and the worksheet set to Precision as Displayed, when I import the data into the mail merge document, it's displaying multiple decimal places. Apr 16, · - Java - Display double in 2 decimal places. Hello, Can you share Java code or script for finding P-value of large data sets: . Decimal definition, pertaining to tenths or to the number See more.
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. However, if you actually want to round the floating point value for further computation, something like the following works:. Notice that there are three different rounding rules you might want to choose: round down ie, truncate after two decimal places , rounded to nearest, and round up.
Usually, you want round to nearest. As several others have pointed out, due to the quirks of floating point representation, these rounded values may not be exactly the "obvious" decimal values, but they will be very very close.
For much much! Assuming you're talking about round the value for printing, then Andrew Coleson and AraK 's answer are correct:. But note that if you're aiming to round the number to exactly Or encode the number as a string with a known precision, and compare that.
See the link in Greg Hewgill's answer to a related question , which also covers why you shouldn't use floating point for financial calculations. There isn't a way to round a float to another float because the rounded float may not be representable a limitation of floating-point numbers. For instance, say you round You can then output any double myDouble with n places after the decimal point with code such as this:.
Obviously you don't really need to create all 5 variables in that function, but I leave them there so you can see the logic. There are probably simpler solutions, but this works well for me--especially since it allows me to adjust the number of digits after the decimal place as I need. Always use the printf family of functions for this. Even if you want to get the value as a float, you're best off using snprintf to get the rounded value as a string and then parsing it back with atof :.
I say this because the approach shown by the currently top-voted answer and several others here - multiplying by , rounding to the nearest integer, and then dividing by again - is flawed in two ways:. To illustrate the first kind of error - the rounding direction sometimes being wrong - try running this program:. Note that the value we started with was less than 0. Of course, 0. Multiplying by thus changes the correct direction to round in. Our number now doesn't even have a fractional part; it's an integer value, just stored with type double.
So the result after rounding it should be the same number we started with, right? Our snprintf method returns the right result again, but the multiply-then-round-then-divide approach fails. That's because the mathematically correct value of When you divide that back by , you get Hopefully that's a sufficient demonstration that using roundf for rounding to a number of decimal places is broken, and that you should use snprintf instead.
If that feels like a horrible hack to you, perhaps you'll be reassured by the knowledge that it's basically what CPython does. Depending on your float implementation, numbers that may appear to be half-way are not. Further, precisely rounding to the nearest 0. Although "1. It rounds toward 1. This incorrect value may be viewed as correct, depending on coding goals. Let me first attempt to justify my reason for adding yet another answer to this question.
In an ideal world, rounding is not really a big deal. However, in real systems, you may need to contend with several issues that can result in rounding that may not be what you expect. For example, you may be performing financial calculations where final results are rounded and displayed to users as 2 decimal places; these same values are stored with fixed precision in a database that may include more than 2 decimal places for various reasons; there is no optimal number of places to keep I have been confronting these issues and evolving my own strategy over the years.
I won't claim that I have faced every scenario or have the best answer, but below is an example of my approach so far that overcomes these issues:. Here the assumption is that the calculation resulted in exactly 6.
The 7th decimal place being 9 in this case causes the Round val,6 function to give the expected result. For this case, there could be any number of trailing 9 s. Rounding to the 8th decimal place as a first step, i. Round val,8 , takes care of the one nasty case whereby a calculated floating point result calculates to 6. Finally, the example from the question This works on negative values as well. I do not know if this approach is mathematically correct for all possibilities. How are we doing?
Please help us improve Stack Overflow. Take our short survey. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. How do I restrict a float value to only two places after the decimal point in C? Ask Question. Asked 11 years, 7 months ago. Active 1 year, 1 month ago. Viewed k times. How can I round a float value such as Sakib Arifin 10 10 bronze badges. Tyler Tyler. You cannot properly round the number itself, because float and double aren't decimal floating-point - they are binary floating-point - so rounding to decimal positions is meaningless.
You can round the output, however. It's not meaningless; it's inexact. There's quite a difference. What kind of rounding you're expecting? Half-up or Rounding to nearest even? Add a comment. Active Oldest Votes. Dale Hagglund Dale Hagglund Can it be modified to support rounding to arbitrary precision? If the former, make what I hope are obvious adjustments to the constant ; otherwise, do the exact same calculations shown above, just with whatever multi precision library you're using.
DaleHagglung The former, thank you. Is the adjustment to replace with pow 10, int desiredPrecision? This should be really easy to see if you write out some decimal values by hand and play around with multiples of Suppose you're working with the value 1. The operation available to you is round to integer. So, how do you move the first three decimal places so that they're left of the decimal point? Now you can round that value to an integer. Can I make this work with doubles too somehow?
Doesn't seem to do the job I want : using floor and ceil. Nobody Jun 20 '14 at Show 12 more comments. It only print 2 decimal points. Mani Kandan 2 2 silver badges 14 14 bronze badges. Andrew Coleson Andrew Coleson 9, 7 7 gold badges 28 28 silver badges 30 30 bronze badges. This way is better because there is no loss of precision.
John Carter John Carter Upvoted for addressing what may be the question behind the question or the question that should have been behind the question! That's a rather important point. Actually Float has 11 to 12 digit for precission.
That should be enough to address HaryantoCiu yeah fair enough, I've editted my answer a little. Daniil Daniil 1, 2 2 gold badges 17 17 silver badges 27 27 bronze badges. A high school test? It's necessary to follow rounding rules.