Compilare: user.cpp: In constructor ‘boss::boss()’: user.cpp:21:36: warning: passing NULL to non-pointer argument 2 of ‘void* memset(void*, int, size_t)’ [-Wconversion-null] memset(son,NULL,sizeof(son));} ^ user.cpp: In function ‘int main()’: user.cpp:62:33: warning: ‘val’ may be used uninitialized in this function [-Wmaybe-uninitialized] nod->tata->son[val]=NULL; ^ user.cpp:48:9: note: ‘val’ was declared here int val; ^