Read a natural number n and print the sum of its digits, computed using a recursive function. Iterative solutions (with while/for) are not accepted; an explicitly self-calling function must be defined.
Define a recursive function sumDigits(n) that returns the digit sum of n. The function must use the relation:
sumDigits(0) = 0
sumDigits(n) = n % 10 + sumDigits(n / 10), for n > 0The program reads from standard input a single natural number `n`. - `0 <= n <= 1.000.000.000` - The implementation must be recursive (define and call a self-calling function).
The program prints to standard output a single natural number: the digit sum of `n`, followed by a newline.
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