Compilare: main.cpp: In function 'int eval(std::string)': main.cpp:52:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | for(int i=0; i<s.length(); i++) { | ~^~~~~~~~~~~ main.cpp:65:22: warning: comparison of integer expressions of different signedness: 'int' and 'const size_type' {aka 'const long unsigned int'} [-Wsign-compare] 65 | if(found != string::npos){ | ~~~~~~^~~~~~~~~~~~~~~ main.cpp:82:26: warning: catching polymorphic type 'class std::exception' by value [-Wcatch-value=] 82 | }catch(exception e){ | ^ main.cpp:90:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<op>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 90 | for(int i = 0; i < opQueue.size() - 1; i++){ | ~~^~~~~~~~~~~~~~~~~~~~