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
It can’t do this without macros:
#define PRINT(EXPR) printf( #EXPR “=%dn”, EXPR)
PRINT( 5+6*7 ) // expands into printf(”5+6*7=%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.