C++ Preprocessor #ifdef #ifndef confusion
I've read everything about them but my compiler is still freaking out about this stuff.
Here is a big question:
when i say
#ifndef _EXAMPLENAME_H_
#define _EXAMPLENAME_H_
//code here
#endif
what is the token for? I don't see a reason for the token to exist! WHAT DOES IT DO? AAAAAAAH SO CONFUSING.
My compiler gives me errors depending on which files use #ifdef and which ones use #ifndef. I have a hard time picking which one to use. I don't understand at all even after reading about this stuff for the past hour.
Help?
Here is a big question:
when i say
#ifndef _EXAMPLENAME_H_
#define _EXAMPLENAME_H_
//code here
#endif
what is the token for? I don't see a reason for the token to exist! WHAT DOES IT DO? AAAAAAAH SO CONFUSING.
My compiler gives me errors depending on which files use #ifdef and which ones use #ifndef. I have a hard time picking which one to use. I don't understand at all even after reading about this stuff for the past hour.
Help?
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