Compilare: main.cpp: In function 'void eval()': main.cpp:23:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | while(i<s.size()) | ~^~~~~~~~~ main.cpp: In function 'std::string evalparrot()': main.cpp:43:9: warning: unused variable 'nr' [-Wunused-variable] 43 | int nr,j; | ^~