Compilare: user.cpp: In member function ‘int parser::getNumber()’: user.cpp:32:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pointer < text.size () && ('0' > text[pointer] || text[pointer] > '9')) { ^ user.cpp:36:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pointer == text.size()) ^ user.cpp:40:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pointer < text.size() && '0' <= text[pointer] && text[pointer] <= '9') { ^ user.cpp: In function ‘int main()’: user.cpp:61:6: warning: unused variable ‘pointer’ [-Wunused-variable] int pointer = 0; ^