CODEWITHSUNDEEP
java
DBell
DBell

Reputation: 23

Rounding to even single decimal point in Java

I am looking for the best way to round to even decimal values. For example I have a double = 4.267833399 and I want to round to the nearest even single decimal place, in this case 4.2 and not 4.3. And 4.3165656 would round to 4.4 not 4.3. I have searched hard and havent found a simple way to do this.

I would like the result as a double.

Thanks

Upvotes: 0

Views: 2412

Answers (3)

BeeOnRope
BeeOnRope

Reputation: 64895

Assuming you want your answer in a double, this should work:

double result = Math.round(input * 5) / 5d;

Upvotes: 2

Peter Lawrey
Peter Lawrey

Reputation: 533442

You can round to one decimal place with

double d = Math.round(x * 10) / 10.0;

Note this will round 4.26 up to 4.3 as it is the closest, if you want to always round down you can do

double d = (long) (x * 10) / 10.0;

I want to round to the nearest even single decimal place

If you want to round to the nearest multiple of 0.2 you can do

double d = Math.round(x * 5) / 5.0;

This will round 4.299 to 4.2 and 4.3 to 4.4

Upvotes: 1

Fraser Graham
Fraser Graham

Reputation: 1

You can use something like this

double myNumber = 12345.6789;
DecimalFormat df = new DecimalFormat("#.0");
df.format(myNumber);

This would return 12345.7

Edit: Noticed you're looking for rounding to an even number. You could use the above method of rounding and then conditionally manipulate your number after if the decimal is odd.

Upvotes: 0

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