C language - input a non-negative integer n, return the sum of the numbers that make it up - Code World

C language - input a non-negative integer n, return the sum of the numbers that make it up

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C language - input a non-negative integer n, return the sum of the numbers that make it up

Write a recursive function DigitSum(n), enter a non-negative integer, and return the sum of the numbers that make up it. For example, if you call DigitSum(1729), it should return 1 + 7 + 2 + 9, and its sum is 19.

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