Split BigInteger into digits and put them in an array

Question

I want split the following biginteger into digits and put it in an array.

BigInteger = 123456789123456789123456789123456789
array[]={1,2,3,4,5,6,7,8,9,1,2,3,4,5,6,7,8,9,1,2,3,4,5,6,7,8,9,1,2,3,4,5,6,7,8,9,}

How can I do this?Thank you.I searched it but couldn't find a better answer.

Vikdor · Accepted Answer · 2012-11-03 06:18:27Z

5

Could do it as follows:

BigInteger value = new BigInteger("123456789123456789123456789123456789");
List<Integer> list = new ArrayList<Integer>();
BigInteger ten = new BigInteger("10");
while (!value.equals(BigInteger.ZERO))
{
    list.add(0, value.mod(ten).intValue());
    value = value.divide(ten);
}

answered Nov 3, 2012 at 6:18

Vikdor

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Comments

Bhesh Gurung · Accepted Answer · 2012-11-03 06:27:19Z

1

Just do toString and turn each character to int and add to array of ints

String biStr = bi.toString();
int[] ints = new int[biStr.length()];
for(int i=0; i<biStr.length(); i++) {
    ints[i] = Integer.parseInt(String.valueOf(biStr.charAt(i)))
}

edited Nov 3, 2012 at 6:27

answered Nov 3, 2012 at 6:17

Bhesh Gurung

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