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Find the sum of digits in 100! (Factorial)

/ Published in: Groovy
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Find the sum of digits in 100!
n! means n × (n − 1) × ... × 3 × 2 × 1

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  1. def factorial2(BigInteger n){
  2.     BigInteger answer = BigInteger.ONE;
  3.  
  4.     for (int i=1; i<=n; i++) {
  5.         answer = answer.multiply(BigInteger.valueOf(i));
  6.     }
  7.     return answer
  8. }
  9.  
  10. def sumDigits(BigInteger n){
  11.     def digitString = n.toString();
  12.     def digitArray = []
  13.  
  14.     digitString.each{ i ->
  15.         digitArray.add( i.toBigInteger() )
  16.     }
  17.     return digitArray.sum()
  18. }

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