*****Listing 9*****


void trace1(const char *,int, const char *);
int trace2(int, const char *, int, const char *);

#define f(arg1, arg2)                                        \
     (trace1(____FILE____, ____LINE____, #arg1 ", " #arg2), \ 
     trace2(f(arg1, arg2),                                      \
             ____FILE____, ____LINE____, #arg1 ", " #arg2))    


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