template_DefaultType

#include <iostream>
using namespace std;

template <typename T1,typename T2=int>
class Test{
public:
    T1 NumNBei(T1 num,T2 N)
    {
        return num*N;
    }
};

void main()
{
  Test<double> t;
  double x=    t.NumNBei(2.3,);
  cout<<x<<endl;
/*
4.6
Press any key to continue
*/
}