long fo0(long, long, long, long, long);
#define ARG1 10
#define ARG2 -10
#define ARG3 -20
#define ARG4 -30

#define ERG (ARG1 - ARG2 - ARG3 - ARG4 + 100)

int ret = fo0(0xdead, ARG1, ARG2, ARG3, ARG4);
printf("ret ist %8i (sollte %8i sein)\n", ret, ERG);
RET(ret == ERG);