Compilare: main.cpp: In function 'bool expresie()': main.cpp:18:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | while (i < e.size() && e[i] != ')') | ~~^~~~~~~~~~ main.cpp: In function 'bool get_number()': main.cpp:43:35: warning: array subscript has type 'char' [-Wchar-subscripts] 43 | value = frc[e[i-1]]; | ^ main.cpp: In function 'bool third_ordin()': main.cpp:54:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 54 | if (i + 2 >= e.size() || (e[i] != 'N' || e[i + 1] != 'O')) ///avem not? | ~~~~~~^~~~~~~~~~~ main.cpp: In function 'void second_ordin(bool&)': main.cpp:63:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | if (i + 2 >= e.size() || (e[i] != 'A' || e[i+1] != 'N')) | ~~~~~~^~~~~~~~~~~ main.cpp: In function 'void first_ordin(bool&)': main.cpp:73:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 73 | if (i + 1 >= e.size() || (e[i] != 'O' || e[i + 1] != 'R')) | ~~~~~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:89:21: warning: array subscript has type 'char' [-Wchar-subscripts] 89 | frc[s] = !frc[s]; | ^ main.cpp:89:31: warning: array subscript has type 'char' [-Wchar-subscripts] 89 | frc[s] = !frc[s]; | ^ main.cpp:87:21: warning: unused variable 'grecu' [-Wunused-variable] 87 | int grecu = 1; | ^~~~~