Compilare: user.cpp: In function ‘int eval(const std::vector<term>&)’: user.cpp:24:7: warning: unused variable ‘p’ [-Wunused-variable] int p = 0; ^ user.cpp: In function ‘std::vector<term> convert(std::string)’: user.cpp:82:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ts.size(); i++) { ^ user.cpp:86:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < ts.size() && isdigit(ts[i])) { ^ user.cpp: In function ‘int prec(char)’: user.cpp:70:1: warning: control reaches end of non-void function [-Wreturn-type] } ^