Rounding up to 2 decimal place

Question

I have this code below, my desired answer is 37.58 and not 37.56 or 37.60 after inputting 37576

BigDecimal n = new BigDecimal(num);
BigDecimal t = new BigDecimal(100);

BigDecimal res = n.divide(t);
BigDecimal b =res.setScale(1, BigDecimal.ROUND_HALF_UP);
DecimalFormat forma = new DecimalFormat("K0.00");
String bigf = forma.format(b);



txtnewk.setText(" " + bigf);

what changes do I have to make?

duplicate of http://stackoverflow.com/questions/2808535/round-a-double-to-2-significant-figures-after-decimal-point and http://stackoverflow.com/questions/3596023/round-to-2-decimal-places/ — SpaceTrucker, Jan 14 '13 at 10:44
I am building a denomination converter whose conversion standard is 1000-1. so in a case where I want to convert 37576 I want my answer to be 37.58 — Brianmuks, Jan 14 '13 at 12:04

score 3 · Answer 1 · answered Jan 14 '13 at 10:42

3

With the following code:

String num = "37576";
BigDecimal n = new BigDecimal(num);
BigDecimal t = new BigDecimal(1000);
BigDecimal res = n.divide(t);
BigDecimal b = res.setScale(2, BigDecimal.ROUND_HALF_UP);

b is 37.58 as desired.

answered Jan 14 '13 at 10:42

assylias

321,522
82
660
783

score 0 · Answer 2 · edited May 23 '17 at 12:27

0

Use this code for rounding numbers:

public static double round(double value, int places) {
    if (places < 0) throw new IllegalArgumentException();

    long factor = (long) Math.pow(10, places);
    value = value * factor;
    long tmp = Math.round(value);
    return (double) tmp / factor;
}

edited May 23 '17 at 12:27

Community

1
1

answered Jan 14 '13 at 10:42

ObAt

2,337
3
24
44

How does this answer the OPs question ? – Fallup Jan 14 '13 at 10:43

score 0 · Answer 3 · answered Jan 14 '13 at 10:45

0

You are using wrong version of divide (if you are rounding it immediately). Value of setScale is wrong. You should have:

BigDecimal res = n.divide(t, 2, BigDecimal.ROUND_HALF_UP);

answered Jan 14 '13 at 10:45

Marek R

32,568
6
55
140

score 0 · Answer 4 · answered Jan 14 '13 at 11:01

Using double you can do

long l = 37576; // or Long.parseLong(text);
double v = Math.round(l / 10.0) / 100.0;
System.out.println(v);

prints

37.58

The first rounded / 10.0 says you want to drop the lowest digit by rounding and the / 100.0 says you want to shift the decimal place by two digits.

Rounding up to 2 decimal place

4 Answers4