Compilare: main.cpp: In function 'bool isInvalid()': main.cpp:23:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for (int i = 0; i < s.size(); i++) | ~~^~~~~~~~~~ main.cpp:37:14: warning: unused variable 'dbg' [-Wunused-variable] 37 | bool dbg = isCif(s[i-1]); | ^~~ main.cpp: In function 'int suma()': main.cpp:50:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | while (it < s.size() && s[it] == '+') | ~~~^~~~~~~~~~ main.cpp: In function 'int produs()': main.cpp:74:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 74 | while (it < s.size() && s[it] == '*') | ~~~^~~~~~~~~~ main.cpp: In function 'int term()': main.cpp:96:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 96 | if (it >= s.size()) | ~~~^~~~~~~~~~~ main.cpp:100:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 100 | while (it < s.size() && isCif(s[it])) | ~~~^~~~~~~~~~ main.cpp:111:1: warning: control reaches end of non-void function [-Wreturn-type] 111 | } | ^