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 &);

The value of parameter will not be changed during the function calls.

friend Circle copy(const Circle &)const ; 

The function is an accessor that does not change any value of class members. Generally, there are to types of functions: accessors and mutators. Accessor: examines but does not change the state of its object.