Compilare: main.cpp: In function 'long long int getnr()': main.cpp:19:14: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | while(pos<s.size() && iscif(s[pos])) | ~~~^~~~~~~~~ main.cpp: In function 'long long int prod()': main.cpp:44:14: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | while(pos<s.size() && (s[pos]=='*' || s[pos]=='/')) | ~~~^~~~~~~~~ main.cpp: In function 'long long int suma()': main.cpp:64:14: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | while(pos<s.size() && (s[pos]=='+' ||s[pos]=='-')) | ~~~^~~~~~~~~