有以下程序 include gtruet NODE {intnum;struct NODE *next;}; main() {struct NODE

有以下程序

#include ＜stdlib.h＞

gtruet 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(sizeef (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．50

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