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  1. Recursive Digit Sum
  2. Discussions

Recursive Digit Sum

  • ldaniel9464
     + 1 comment

    My code seems to work in Eclipse but it turns wrong in the test cases

    public static int superDigit(String n, int k) {
	    // Write your code here
	        BigInteger superDigit = new BigInteger(n);
	        StringBuilder sb = new StringBuilder();
	        for (int i = 0; i < k; i++) {
	            sb.append(n);
	        }
	        n = sb.toString();
	        char[] superDigitCharArray;
	        while(superDigit.compareTo(new BigInteger("10")) != -1){
	            int sum = 0;
	            superDigitCharArray = n.toCharArray();
	            for (char c : superDigitCharArray) {
	                sum += Character.getNumericValue(c); 
	            }
	            superDigit = new BigInteger(sum + "");
	            n = superDigit + "";
	        }
	        

	        return superDigit.intValue();
	    }