const before parameter vs const after function name c++

Question

What is the difference betweeen something like this

friend Circle copy(const Circle &);

and something like this

friend          


        

Answer 1

friend Circle copy(const Circle &);//refers to constant parameter of the function. cant' change the value stored by parameter.

Need to remove friend in your example Circle copy(Circle&) const; //can't change this poniter value named as Constant member function