#include <stdio.h>

#define GENAU_RECHNEN 1

#define negativ -

#define TEXT "Hallo, Welt!\n"

#ifdef GENAU_RECHNEN
#define TYP double
#else
#define TYP int
#endif

int main()
{
	TYP a;
	printf("%d\n", negativ 10);
	printf(TEXT);

	a = cos(2);
	return 0;
}