题解 | 数位之和

#include <stdio.h>
#include<stdlib.h>

int main()
{
    int n=0;
    scanf("%d",&n);
    int N=abs(n);
    int sum=0;
   while(1)
   {
     int ret =N%10;
     sum=sum+ret;
     N=N/10;
     if(N<10)
    {
        sum=sum+N;
        break;
    }
   }
   printf("%d",sum);
}