помогите написать задачу не по шаблонам у меня не получается

[Djkjlbvbh]

#include <iostream>
 
template<typename T>
T convert( int some_number )
{
    return static_cast< T >( some_number );
}
 
template<typename T>
T convert( double some_number )
{
    return static_cast< T >( some_number );
}
 
template<typename T>
T convert( float some_number )
{
    return static_cast< T >( some_number );
}
 
int main()
{
    int a = 15;
    double b = 12.4;
    float c = 7.7;
 
    std::cout << "Numbers: " << a << " " << b << " " << c << std::endl;
 
 
    std::cout << std::fixed << "After converting: a = " << convert<float>( a )
        << ", b = " << convert<int>( b ) << ", c = " << convert<int>( c ) << std::endl;
    system("pause");
}

[_Bers]

http://rextester.com/PZSAV43147

#include <iostream>

template<class T, class B>
T convert( B&& value )
{ 
    return static_cast<T>(value);
}


int main()
{
    int    a = 15;
    double b = 12.4;
    float  c = 7.7f;

    std::cout << "Numbers: " << a << ", " << b << ", " << c << '\n';


    std::cout << std::fixed 
              << "After converting: a = " << convert<float>(a) 
              << ", b = " << convert<int>( b ) 
              << ", c = " << convert<int>( c ) 
              << '\n';
}

[Djkjlbvbh]

большое спасибо!