代码结果：

#include<stdio.h>
int DigitSum(unsigned int n)
{
	if (n > 9)
		return DigitSum(n / 10) + (n % 10);
	else
		return n;
}
int main()
{
	unsigned int n;
	scanf("%u", &n);
	int sum = DigitSum(n);
	printf("%d\n", sum);
	return 0;
}