Compilare: main.cpp: In member function 'nod* ARBORE::del(nod*, int)': main.cpp:234:11: warning: unused variable 'nod2' [-Wunused-variable] 234 | {nod *nod2,*nod3; | ^~~~ main.cpp: In member function 'int ARBORE::pref(int)': main.cpp:231:5: warning: control reaches end of non-void function [-Wreturn-type] 231 | } | ^ main.cpp: In member function 'int ARBORE::suf(int)': main.cpp:201:5: warning: control reaches end of non-void function [-Wreturn-type] 201 | } | ^