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#include <stdio.h>
#include <stdlib.h>

#ifdef ENABLE
#   define my_printf(...)   printf(__VA_ARGS__)
#else
#   define my_printf(...)   // → "" (will be removed from code)
#endif

int main(int argc, char* argv[]) {

    int a = 5;
    int b = a * 5;

    my_printf("a * b == %d\n", a * b);

    return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */

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