Compilare: user.cpp: In function ‘int main()’: user.cpp:44:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0;j<num.length();j++) ^ user.cpp:59:17: warning: variable ‘q’ set but not used [-Wunused-but-set-variable] int q,w; ^ user.cpp:59:19: warning: variable ‘w’ set but not used [-Wunused-but-set-variable] int q,w; ^