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Advantages of a macro over a function?

Macro gets to see the Compilation environment, so it can expand __ TIME FILE #defines. It is expanded by the preprocessor.
For example, you can’t do this without macros
#define PRINT(EXPR) printf( #EXPR “=%d
”, EXPR)
PRINT( 5+67 ) // expands into printf(”5+67=%d”, 5+6*7 );
You can define your mini language with macros:
#define strequal(A,B) (!strcmp(A,B))Macros are a necessary evils of life. The purists don’t like them, but without it no real work gets done.