Compilare: user.cpp: In function ‘void functie(std::string, int)’: user.cpp:30:27: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if ( a[i] >= 'A' && a[i] <= 'Z' || !valid ) ^ user.cpp: In function ‘std::string print(sir)’: user.cpp:98:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < x1.length(); ++i ) ^