#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
int digitsum(int n){
int sum = 0;
int m = 0;
if (n > 0){
m = n % 10;
n = n / 10;
sum = m + digitsum(n);
}
return sum;
}
int main(){
int n;
printf("请输入需要递归的数:\n");
scanf("%d", &n);
printf("%d\n",digitsum(n));
system("pause");
return 0;
}