#include <ctime>
#include <iostream>

int main()
{
  cout << "Druecke die ENTER-Taste...";
  std::time_t start = std::time(NULL);  
  std::cin.get();
  std::time_t stop = std::time(NULL);  

  std::cout << "Du hast " 
            << std::difftime(stop, start) 
            << " Sekunden gebraucht.\n";
}