Compilare: user.cpp: In function ‘int code(char*)’: user.cpp:14:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] s+=v[cod[i]]*p; ^ user.cpp: In function ‘char* decode(int)’: user.cpp:22:10: warning: address of local variable ‘cod’ returned [-Wreturn-local-addr] char cod[6]; ^ user.cpp: In function ‘int main()’: user.cpp:39:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[alfabet[i]]=i; ^