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为什么老是wrong啊,水题受不鸟啊

Posted by n55iw at 2011-07-17 23:17:55 on Problem 1519
#include<iostream>
using namespace std;
int xun(int p)
{
    int sum=0;
    while(p>0)
    { sum=sum+p%10;
      p=p/10;
    }
      return sum;
}
int main()
{
    int n;
    while(cin>>n)
    {
      if(n==0) break;
      int s=xun(n);
      while(s>=10)
      {
           s=xun(s);
      }
      
      cout<<s<<endl;
    }
    return 0;
   }
                  

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