Compilare: user.c:6:5: warning: conflicting types for built-in function ‘exp’ [enabled by default] int exp (long long a,long long b) ^ user.c: In function ‘main’: user.c:29:5: warning: format ‘%lld’ expects argument of type ‘long long int’, but argument 3 has type ‘int’ [-Wformat=] fprintf (fout,"%lld",exp(N,P)); ^ user.c:26:12: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%lld",&N); ^ user.c:27:12: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%lld",&P); ^