Hi, 
Just need a little help on C. 

Suppose I want to define a word BLABLABLA as 1 

So, I write : #define BLABLABLA 1 

But it might be defined somewhere else in some other header file. 
So I write : 

#ifdef BLABLABLA 
#undef BLABLABLA 
#endif 

#define BLABLABLA 1 

That solves the problem. But the other Macro gets undefined in that file
below this line. But that might create problem. 
So e 




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