Compilare: main.cpp: In function 'int ec(int&)': main.cpp:266:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 266 | while (i < s.length() && s[i] != ')') | ~~^~~~~~~~~~~~ main.cpp:294:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 294 | else while (i < s.length() && cif(s[i])) | ~~^~~~~~~~~~~~ main.cpp:299:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 299 | if (i < s.length() && (s[i] == '*' || s[i] == '/')) | ~~^~~~~~~~~~~~ main.cpp:315:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 315 | if (i == s.length() || (s[i] == '+' || s[i] == '-')) | ~~^~~~~~~~~~~~~ main.cpp:311:20: warning: 'pr' may be used uninitialized in this function [-Wmaybe-uninitialized] 311 | pr *= val; | ~~~^~~~~~