Code:
   1.
      #include <iostream>
   2.
      #include <string>
   3.
      #include <sstream>
   4.
       
   5.
      int main()
   6.
      {
   7.
      for ( int i = 0; i < 10; ++i ){
   8.
      std::string filenameRoot("file_");
   9.
      std::stringstream ss;
  10.
      ss << filenameRoot << i << ".txt";
  11.
      std::cout << ss.str() << std::endl;
  12.
      }
  13.
      return 0;
  14.
      }


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