Compilare: user.cpp: In member function ‘void BigInt::add_digit(uint32_t, bool, std::string&)’: user.cpp:160: warning: format ‘%lu’ expects type ‘long unsigned int’, but argument 3 has type ‘uint64_t’ user.cpp:160: warning: format ‘%lu’ expects type ‘long unsigned int’, but argument 4 has type ‘uint64_t’ user.cpp: In function ‘int main()’: user.cpp:229: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result