Compilare: main.cpp: In function 'int getNumber(std::string&, int&)': main.cpp:20:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | while (poz < s.size() && '0' <= s[poz] && s[poz] <= '9') { | ~~~~^~~~~~~~~~ main.cpp: In function 'bool evalExp(std::string&, int&, int&)': main.cpp:33:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | if (poz == s.size() or s[poz] == ')') | ~~~~^~~~~~~~~~~