You cannot overload on the const. If you try to define both int a(int b) and int a(const int b) the compiler will complain about a redefinition. You can declar

You cannot overload on the const. If you try to define both int a(int b) and int a(const int b) the compiler will complain about a redefinition. You can declare the function using int a(int b) in the header and then define it via int a(const int b).