#include <stdio.h>

#if defined(_MSC_VER)
//     Windows
#      define BREAK  ::DebugBreak();
#elif defined(__i386__) && defined(__GNUC__)
//     gcc on some Intel processor                                                                                  
#      define BREAK __asm__ __volatile__ ( "int $3" );
#else
//     Hopefully, some other gcc                                                                                        
#      define BREAK ::abort()
#endif

#define ASSERT(test_expr, message) \
if (! (test_expr)) {\
printf("%s\nAssertion \"%s\" failed in %s at line %d.\n", \
message, #test_expr, __FILE__, __LINE__);\
BREAK;\
}


int main(int argc, char** argv) {
    int x = 3;
    ASSERT(x > 4, "Something bad");
    return 0;
}