how to get sum of the digits of double

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Hello i have a double number and i want to calculate the sum of the digits

for example 
33506 =====>  17 =====> 8
25822 =====>  19 =====> 10 ======> 1
 

  1. What's the point — it's meaningless.

  2. Your example shows an int not a double. Doubles have infinite digits right of the decimal point.

  3. Not compiled, not tested, just typed. 

    int sum_of_digits(uint n){
   int sum=0;
   while(n>0){ sum += n % 10; n /= 10; }
   return sum < 10 ? sum : sum_of_digits(sum);
}
    Not compiled, not tested, just typed.
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