#include <sstream>
#include <iostream>
 
int main()
{
   std::string input;
   std::stringstream stream;
   std::string name;
   double amount;
 
   int repeat = 4;
   while(repeat--)   // to demonstarte
   {
      std::getline(std::cin, input);      // enter a name, a whitespace and a number
      stream.str(input);
      stream >> name >> amount;           // problem here
      std::cout << "Output: " << name << " " <<amount << std::endl;
      stream.str( std::string() );   // or stream.str("");
      stream.clear();
   }
   return 0;
}
 

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Name1 100
Name2 200
Name3 300
Name4 400