Compilare: user.cpp: In function ‘std::vector<int> convert_to_rpm(std::string&)’: user.cpp:26:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind < s.size()){ ^ user.cpp: In function ‘int get_num(std::string&, int&)’: user.cpp:68:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(isdigit(s[ind]) && ind < s.size()){ ^ user.cpp: In function ‘int get_equals()’: user.cpp:89:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i<s.size(); i++){ ^ user.cpp:111:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int get_val()’: user.cpp:157:74: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((s[ind] == ',' || s[ind] == '(' || s[ind] == ')') && ind < s.size()){ ^ user.cpp:203:1: warning: control reaches end of non-void function [-Wreturn-type] } ^