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single_digit
//'main' method must be in a class 'Rextester'. //Compiler version 1.8.0_111 import java.util.*; import java.lang.*; class Rextester { public static void main(String args[]){ System.out.println(singleDigit(9223));; } public static int singleDigit(int input){ int sumOfDigit= getDigitSum(input); if(sumOfDigit>=10){ sumOfDigit = singleDigit(sumOfDigit); } return sumOfDigit; } static int getDigitSum(int digit){ int sum=0; for (int i = digit; i >0 ; i=i/10) { sum+=i%10; } return sum; } }
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