constant variables not working in header

Question

if I define my constant varibles in my header like this...

extern const double PI = 3.1415926535;
extern const double PI_under_180 = 180.0f / PI;
extern cons         


        

Answer 1

in declaring global const within header causes that each compilation unit including this hader will have own definitions global definitions with the same name. Then linker does not like that.

If You really need these in header then probably You should declare them as static.