#include <iostream>
#include <typeinfo>
 
// Declaration of template.
template <typename T>
void print_typeof (T const&);
 
 
// Implementation/definition of template.
template <typename T>
void print_typeof (T const& x)
{
  std::cout << typeid(x).name() << std::endl;
}
 
 
int main()
{
  double ice = 3.0;
  print_typeof(ice);  // call function template for type double
}