Compilare: main.cpp: In function 'int number()': main.cpp:16:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | while(i<s.size() && isdigit(s[i])) | ~^~~~~~~~~ main.cpp: In function 'std::string sir()': main.cpp:26:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | while(i<s.size() && isalpha(s[i])) | ~^~~~~~~~~ main.cpp: In function 'std::string eval2()': main.cpp:67:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | while(i<s.size() && s[i]!=']') | ~^~~~~~~~~ main.cpp: In function 'void eval()': main.cpp:92:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 92 | while(i<s.size()) | ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:112:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 112 | for(int j=0; j<s.size(); j++) | ~^~~~~~~~~