48) 有以下程序 #include struct NODE{ int num; struct NODE *next; }; main) { struct NODE *p,*q,*r; int sum=0; p= struct NODE *)malloc sizeof struct NODE)); q= struct NODE *)malloc sizeof struct NODE)); r= struct NODE *)malloc sizeof struct NODE)); p->num=1;q->num=2;r->num=3; p->next=q;q->next=r;r->next=NULL; sum+=q->next->num;sum+=p->num; printf “%d\n”,sum); } 执行后的输出结果是
(A)3
(B)4
(C)5
(D)6