#include <iostream>
#include <sstream>
#include <conio.h>
 
using namespace std;
 
template<typename T>
T strNum(const string& str)
{
  stringstream ss(str);
  T tmp;
  ss >> tmp;
  if (ss.fail())
  {
    string s = "Can`t format  " + str + " in number!";
    cout << s << endl; 
  }
  return tmp;
}
 
int main(int argc, char** argv) 
{
  double d = strNum<double>("300e-5");
  cout << d << endl;
  float f = strNum<float>("345.234");
  cout << f << endl;
  int i = strNum<int>("345.05");
  cout << i << endl;
  int err= strNum<int>("asdf");
  _getch();
  return(EXIT_SUCCESS);
}