Compilare: user.cpp: In function ‘void Folder()’: user.cpp:40:31: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] cale[lcale]=NULL; ^ user.cpp:43:24: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] cale[lcale]=NULL; ^ user.cpp:48:33: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] char aux[LMAX]={NULL}; ^ user.cpp: In function ‘int main()’: user.cpp:75:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<cai.size();i++) ^