vägverket.cpp

#include <iostream>
#include <iomanip>
#include <sstream>
#include <vector>

using namespace std;

int main()
{     
  vector<double> v;  
  while(cin)
  {
    string line;
    getline(cin, line);
    
    istringstream iss(line);
    double number;
    iss >> ws;
    if (iss.eof())
      {
	cout << "tom rad" << endl;
	return 0;
      }

    iss >> number;
    if (iss.fail())
      {
	cout << "ej giltigt tal" << endl;
	continue;
      }
    
    iss >> ws;
    if (iss.eof())
      {
	v.push_back(number);
	cout << "korrekt inläsning: " << number << endl;
      }
    else
      {
	cout << "data kvar på raden" << endl;
      }
    
  }
  return 0;
}