Compilare: main.cpp: In function 'bool expresie()': main.cpp:25:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | while(ind + 1 < s.size() && s.substr(ind, 2) == "OR") | ~~~~~~~~^~~~~~~~~~ main.cpp: In function 'bool termen()': main.cpp:35:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | while(ind + 2 < s.size() && s.substr(ind, 3) == "AND") | ~~~~~~~~^~~~~~~~~~ main.cpp: In function 'bool factor()': main.cpp:46:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | while(ind + 2 < s.size() && s.substr(ind, 3) == "NOT") | ~~~~~~~~^~~~~~~~~~ main.cpp: In function 'bool numar()': main.cpp:66:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | if (ind + 3 < s.size() && s.substr(ind, 4) == "TRUE") { | ~~~~~~~~^~~~~~~~~~ main.cpp:69:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 69 | } else if (ind + 4 < s.size() && s.substr(ind, 5) == "FALSE") { | ~~~~~~~~^~~~~~~~~~