Sum of the digits of the number 2^1000 [closed]

Answer 1

int result = 0;

String val = BigInteger.valueOf(2).pow(1000).toString();

for(char a : val.toCharArray()){
    result = result + Character.getNumericValue(a);
}
System.out.println("val ==>" + result);

It's pretty simple if you know how to use the biginteger.