Compilare: user.cpp: In function ‘int main()’: user.cpp:34:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < strlen(s); ++ i) ^ user.cpp: In function ‘int value(char)’: user.cpp:26:1: warning: control reaches end of non-void function [-Wreturn-type] } ^