Compilare: user.cpp: In function ‘int eval(const std::vector<std::basic_string<char> >&)’: user.cpp:14:7: warning: unused variable ‘p’ [-Wunused-variable] int p = 0; ^ user.cpp: In function ‘std::vector<std::basic_string<char> > convert(std::string)’: user.cpp:78:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ts.size(); i++) { ^ user.cpp:82:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < ts.size() && isdigit(ts[i])) { ^ user.cpp:76:8: warning: unused variable ‘havenum’ [-Wunused-variable] bool havenum = false; ^ user.cpp:77:7: warning: unused variable ‘num’ [-Wunused-variable] int num = 0; ^ user.cpp: In function ‘int prec(char)’: user.cpp:64:1: warning: control reaches end of non-void function [-Wreturn-type] } ^