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What's wrong with C51 conditional compiled?

Nantian Gumo 

#define RR0  1
#define RR1  0

void main()
{
...
#if RR0
precedure0();
#elif RR1
precedure1();
#endif
...
}
when compiled ,main() 'LCALL' precedure0(),just right.but when definition changed ,as following:
#define RR0 0
#define RR1 1

the program can never be compiled and link.can you tell me what the matter is ?

Best regards,
Nantiangumo

0