How to round decimal numbers in Android

Question

Possible Duplicate:
Double value to round up in Java

I am getting float number as input and I want it to round to 2 digits after decimal point. i.e. for example if I get 18.965518 as input, I want it to be 18.97. How to do it?

wouldn't you want it to be 18.97? – Kaiser Wilhelm Sep 19 '11 at 14:32 — Kaiser Wilhelm, Sep 19 '11 at 14:32
@ userSeven7s: i was trying for solution. – Soniya Sep 19 '11 at 14:45 — Soniya, Sep 19 '11 at 14:45

score 45 · Answer 1 · answered Sep 19 '11 at 14:48

45

DecimalFormat uses String (thus allocates additional memory), a big overhead compared to

(float)Math.round(value * 100) / 100

answered Sep 19 '11 at 14:48

vmatyi

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Richard Ev · Accepted Answer · 2013-03-22T14:14:59.217

39

You can use the DecimalFormatobject, similar to regular Java.

Try

double roundTwoDecimals(double d)
{
    DecimalFormat twoDForm = new DecimalFormat("#.##");
    return Double.valueOf(twoDForm.format(d));
}

(code example lifted from http://www.java-forums.org/advanced-java/4130-rounding-double-two-decimal-places.html)

edited Mar 22 '13 at 14:14

answered Sep 19 '11 at 14:31

Richard Ev

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How to round decimal numbers in Android

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