CODEWITHSUNDEEP
javaarraylistbiginteger
user2423959
user2423959

Reputation: 834

use sum and multiplication of a BigInteger

I've come across a situation where I have to perform sum and multiplication of the elements of an ArrayList and for this normally I use:

sum+=a.get(i)*b.get(i);

which gives me the exact output I want, but here in my case I've got to do the same with ArrayList of BigInteger type, I've tried it with the below statement, but it is not working as expected.

sum=(a.get(i).multiply(b.get(i))).add(sum);

please let me know how I can do it.

Thanks.

Upvotes: 1

Views: 5472

Answers (2)

zEro
zEro

Reputation: 1263

Your question is extremely unclear, and as such shouldn't warrant an answer. However, see if the following might help you.

public static void main(String[] args) {
    BigInteger b1 = new BigInteger("1000"), b2 = new BigInteger("1000");
    System.out.println("b1:      " + b1);
    System.out.println("b1 * b2: "+ b1.multiply(b2));
}

Also ensure that you are not falling into the following pit. BigInteger is immutable.

Upvotes: 2

Rasool
Rasool

Reputation: 67

BigInteger sum = new BigInteger("10");
List<BigInteger> list = new ArrayList<BigInteger>();
list.add(new BigInteger("2"));
list.add(new BigInteger("3"));
sum=(list.get(0).multiply(list.get(1))).add(sum);
System.out.println(sum);

Upvotes: 0

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