My program uses several global variables to handle things that a lot of functions will be using and changing ( HDCs, HWNDs, etc ) The unfortunate thing is that these functions are spread across many differant files. How can I declare a global variable in a header file without redefinition errors?
Last edited by YingPar; 06-04-2003 at 06:04 PM.
Use inclusion guards with the preprocessor:
Code:#ifndef DEFS_H_ #define DEFS_H_ // Definitions go here #endif
My best code is written with the delete key.
You can declare global variables in a .cpp file like this:
double pi=3.14;
and then use
extern int pi;
in the other .cpp files. If your globals are declared as const, then they must be declared with the extern key word as well, like:
extern const double pi = 50;
so they are accessible from another .cpp file:
extern const double pi;
Thanks, it seems to be working now
