Compilare: main.cpp: In function 'bool evaluare()': main.cpp:57:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | for(i = 0; i < sir.size(); i++){ | ~~^~~~~~~~~~~~ main.cpp:54:12: warning: unused variable 'j' [-Wunused-variable] 54 | int i, j; | ^ main.cpp: In function 'int main()': main.cpp:129:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 129 | for(j = 0; j < s.size(); j++){ | ~~^~~~~~~~~~ main.cpp:134:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 134 | while(isalpha(s[j]) and j < s.size()){ | ~~^~~~~~~~~~ main.cpp:155:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 155 | for(j = 0; j < s.size(); j++){ | ~~^~~~~~~~~~ main.cpp:160:43: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 160 | while(isalpha(s[j]) and j < s.size()){ | ~~^~~~~~~~~~ main.cpp:124:9: warning: unused variable 'len' [-Wunused-variable] 124 | int len, i, j, n; | ^~~