高中 d392: 讀取練習——強大的加法！

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#include <iostream>
#include <sstream>
using namespace std;

int main() {
     string s1 ;
     while(getline(cin, s1))
     {
         string s2 ;
         long int x = 0 , value = 0 ;
         for(int i = 0 ; i <= s1.length() ; i++)
         {
             if(s1[i] == ' '|| s1[i] == '\0')
             {
                 stringstream ss(s2); 
                 ss >> x;
                 value += x ;
                 //Init
                 s2 = "" ;
                 x = 0 ;
             }
             else
             {
                 s2 += s1[i];
             }
         }
         cout << value << endl ;
     }
     return 0;
}