比较基础

/数位和/
#include<cstdio>
#include<iostream>
using namespace std;
const int maxn = 100;
int main()
{
int n;
int num = 0;
int a[maxn];
cin>>n;
do{
a[num++] = n%10;
n = n/10;
}while(n!=0);</iostream></cstdio>

int sum = 0;
for(int i = num-1; i>=0; i--)
{
    sum = sum + a[i];
}
cout<<sum<<endl;

}