Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:9:5: error: ‘cin’ was not declared in this scope cin.getline(s,256); ^ user.cpp:11:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<strlen(s)-1;++i) ^ user.cpp:12:5: error: ‘cout’ was not declared in this scope cout << "Hello world!" << endl; ^ user.cpp:8:17: warning: unused variable ‘v’ [-Wunused-variable] char s[256],v[]="aeiou", c[]="bcdfghjklmnpqrstvwxyz"; ^ user.cpp:8:30: warning: unused variable ‘c’ [-Wunused-variable] char s[256],v[]="aeiou", c[]="bcdfghjklmnpqrstvwxyz"; ^ user.cpp:10:12: warning: unused variable ‘nr’ [-Wunused-variable] int i, nr=0; ^