macro without definition in C

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1. C preprocessor - Wikipedia, the free encyclopedia

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   The C preprocessor or cpp is the macro preprocessor for the C and C++ computer ... 1.3 Macro definition and ... * 57.29578) â€" without parentheses, (r + 1 ...

   en.wikipedia.org/wiki/C_preprocessor - Cached

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c++ - macro without definition in C - Stack Overflow

What is the use/applicability of macro function without defination: #ifndef __SYSCALL #define __SYSCALL(a, b)