Do you know that? 73% like freelancing because there is no commute / can work from anywhere next

Can static variables be declared in a header file?

You can’t declare a static variable without defining it as well (this is
 because the storage class modifiers static and extern are mutually
 exclusive). A static variable can be defined in a header file, but this
 would cause each source file that included the header file to have its

own private copy of the variable, which is probably not what was
 intended.