Compilare: main.cpp: In function 'int parseNumber(std::string&, int&)': main.cpp:12:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | while(position < s.length() && isdigit(s[position])){ | ~~~~~~~~~^~~~~~~~~~~~ main.cpp: In function 'void solveEquation(std::string&, int&, int&, int)': main.cpp:22:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | while(position < s.length()){ | ~~~~~~~~~^~~~~~~~~~~~ main.cpp:30:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | if(position < s.length() && s[position] == 'x') valueX = number * sign * side; | ~~~~~~~~~^~~~~~~~~~~~