有以下程序

#include

struct NODE

{ int num; struct NODE *next; };

main（）

{ struct NODE *p,*q,*r;

p=（struct NODE*）malloc（sizeof（struct NODE））;

q=（struct NODE*）malloc（sizeof（struct NODE））;

r=（struct NODE*）malloc（sizeof（struct NODE））;

p->num=10; q->num=20; r->num=30;

p->next=q;q->next=r;

printf（"%d＼n ",p->num+q->next->num）;

}

程序运行后的输出结果是

A．10

B．20

C．30

D．40

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