Compilare: main.cpp: In function 'long long int numify(const string&)': main.cpp:10:10: warning: statement has no effect [-Wunused-value] 10 | for (ind; ind < a.size(); ind++) | ^~~ main.cpp:10:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 10 | for (ind; ind < a.size(); ind++) | ~~~~^~~~~~~~~~