how to convert double to 2 number after the dot?

Question

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Round a double to 2 significant figures after decimal point

how to convert double to 2 number after the dot ?

for example:

double x=123.45678;

i need that x=123.45 (in java for android)

thanks in advance

Do you want to convert `x` from `double` to different type (such as `String` with only two digits after the dots printed in it)? Or do you want to keep the double but truncate that part? — sinelaw, Sep 14 '11 at 11:47
follow this link http://stackoverflow.com/questions/153724/how-to-round-a-number-to-n-decimal-places-in-java — Yashwanth Kumar, Sep 14 '11 at 11:47

score 40 · Accepted Answer · answered Sep 14 '11 at 11:46

40

x = Math.floor(x * 100) / 100;

answered Sep 14 '11 at 11:46

10

i used this method but if the number has example like 6.50 it shows 6.5. how i can add the zero? – George Panayi Mar 08 '13 at 01:50
@GeorgePanayi, you mean string formatting, see https://stackoverflow.com/questions/10959424/show-only-two-digit-after-decimal. First check whether `Math.abs(x) % 1.0 < 0.005;`. If it is whole, format `x` as whole number, and if fractional, then use `new DecimalFormat("###########0.00").format(x);`. – CoolMind Nov 29 '19 at 13:35

score 19 · Answer 2 · answered Sep 14 '11 at 11:54

19

try this code

double x=123.45678;
DecimalFormat df = new DecimalFormat("#.##");
String dx=df.format(x);
x=Double.valueOf(dx);

answered Sep 14 '11 at 11:54

Balaji.K

Exception in thread "main" java.lang.NumberFormatException: For input string: "123,46" at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:2043) at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110) at java.lang.Double.parseDouble(Double.java:538) at java.lang.Double.valueOf(Double.java:502) – iXô May 18 '16 at 08:25
I uses it but it shows value in this form "7016,01" instead of "7016.01". It show a qoma instead of dot. – sajid45 Mar 17 '17 at 09:56
replace , by . in dx: x=Double.valueOf(dx.replace(',', '.')); – Riadh Sep 13 '17 at 14:30
@sajid45, how can it be? Does it depend on regional settings? – CoolMind Nov 27 '19 at 11:42

score 14 · Answer 3 · answered Sep 14 '11 at 11:50

14

use this,

  NumberFormat formatter = new DecimalFormat("#0.00");
 x=formatter.format(x);

answered Sep 14 '11 at 11:50

ilango j

score 9 · Answer 4 · answered Sep 14 '11 at 11:50

9

Use NumberFormat class for correct formatting of numbers.

Specifically in your case you can do the following. Although this is not ver L10N friendly.

mNumberFormat = NumberFormat.getInstance();
mNumberFormat.setMinimumFractionDigits(2);
mNumberFormat.setMaximumFractionDigits(2);

answered Sep 14 '11 at 11:50

EvilDuck

score 8 · Answer 5 · answered Sep 14 '11 at 11:51

You'll be doing something like this:

NumberFormat nf = NumberFormat.getInstance(); // get instance
nf.setMaximumFractionDigits(2); // set decimal places
String s = nf.format(x);

You can also cast it back to a double.

score 2 · Answer 6 · answered Sep 14 '11 at 12:00

2

If you want to get two digits correctly rounded, I would go with BigDecimals:

        BigDecimal bd = new BigDecimal(x);
        System.out.println(bd.setScale(2,BigDecimal.ROUND_HALF_EVEN).toPlainString());

answered Sep 14 '11 at 12:00

Kris

6 Answers6