Compilare: user.cpp: In function ‘int main()’: user.cpp:32:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<strlen(x); j++) s+=x[j]-'0'; ^ user.cpp: In function ‘int cifracontrol(int)’: user.cpp:21:12: warning: ‘s’ may be used uninitialized in this function [-Wmaybe-uninitialized] return s; ^ user.cpp: In function ‘int main()’: user.cpp:34:25: warning: ‘s’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(a!=9) g << 9-a << "\n"; ^