以下程序运行后的输出结果是【 】。 include <stdio.h> struct NODE { int num;struct NODE * next; main ( ) { struet NODE s[3]={ {./0},{2,/0},{3,/O}},*p,*q,*r; int sum = 0; s[0].next=s+1; s[1].next=s+2;s[2].next=s; p=s; q=p->next; r=q->next: sum+=q->next->num; sum+=r->next->next->num; prinff( '% d /n', sum); }