Compilare: user.cpp: In constructor ‘Reader::Reader(const int&)’: user.cpp:56:38: warning: argument to ‘sizeof’ in ‘void* memset(void*, int, size_t)’ call is the same expression as the destination; did you mean to provide an explicit length? [-Wsizeof-pointer-memaccess] memset(buffer_, 0, sizeof(buffer_)); ^ user.cpp: In function ‘int main()’: user.cpp:100:9: warning: unused variable ‘N2’ [-Wunused-variable] int N2 = 0, i; ^