#define, #undef usage

[density]

if i do something like:

#define a 1
#define b 2
#define c 3 

do i have to do an

#undef 

for them at the end of the file? or will defining a constant like this only hold for the .cc file you are working in or ?? is this bad practice like the evil global variable??

[mobotus]

It is my understanding that #undef is used if you want to give another definition for an existing macro

http://www.cplusplus.com/doc/tutorial/preprocessor/