sum BigInteger Of Digits - Java java.math

Java examples for java.math:BigInteger

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Description

sum BigInteger Of Digits

Demo Code


//package com.java2s;
import java.math.BigInteger;

public class Main {
    public static void main(String[] argv) throws Exception {
        BigInteger bint = new BigInteger("1234");
        System.out.println(sumOfDigits(bint));
    }/*from  w ww  . j a v  a  2 s  . co  m*/

    public static BigInteger sumOfDigits(BigInteger bint) {
        BigInteger sum = BigInteger.ZERO;

        BigInteger currDigit = null;
        do {
            BigInteger divisor = findNearestPowerOfTen(bint);

            currDigit = bint.divide(divisor);
            sum = sum.add(currDigit);
            bint = bint.mod(divisor);
        } while (currDigit.compareTo(BigInteger.ZERO) > 0);

        return sum;
    }

    public static BigInteger findNearestPowerOfTen(BigInteger bint) {
        BigInteger divisor = BigInteger.ONE;

        int length = bint.toString().length();
        for (int i = 0; i < length - 1; i++) {
            divisor = divisor.multiply(BigInteger.TEN);
        }

        return divisor;
    }
}

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