Class Template in C++

#include <iostream.h>
template <class T>
class example {
  private:
T elems;

  public:

example(T i)
{
elems=i;
}
void show()
{
cout<<" output="<<elems;
}
};
void main()
{
example<int> e1(5);
cout<<"\nFor integer=";
e1.show();
cout<<"\nFor float=";
example<float> e2(2.5);
e2.show();

cout<<"\nFor char=";
example<char> e3('A');
e3.show();

}