Compilare: main.cpp: In function 'int main()': main.cpp:14:29: warning: operation on 'n' may be undefined [-Wsequence-point] case 2: cout<<n--<<' '<<n--<<'\n'; break; ~^~ main.cpp:15:31: warning: operation on 'st' may be undefined [-Wsequence-point] case 3: cout<<st++<<' '<<st++<<' '<<st++<<'\n'; break; ~~^~