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Home > C Interview Questions >

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 cant do this without macros
#define PRINT(EXPR) printf( #EXPR =%d\n, 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 dont like them, but without it no real work gets done.

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