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// 258. Add Digits
#include <stdio.h>
// given an integer 'num', repeatedly add all its digits until
// the result has onlye one digit and return it
int addDigits(int num) {
int sum = 0;
while (num) {
sum += num % 10;
num /= 10;
}
if (sum < 10)
return sum;
else
return addDigits(sum);
}
int main() {
printf("%d\n", addDigits(38)); // expect: 2
printf("%d\n", addDigits(0)); // expect: 0
}
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