Compilare: user.cpp: In function ‘void back_baz(char)’: user.cpp:58:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] sumb += primes[p]; ^ user.cpp:61:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] sumb -= primes[p]; ^ user.cpp: In function ‘int main()’: user.cpp:65:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cumpanit.in", "r", stdin); ^ user.cpp:66:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cumpanit.out", "w", stdout); ^ user.cpp:71:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^