单选题有以下程序:#include main(){ struct node {  int n;  struct node *next; } *p; struct node x[3] = {{2,x+1},{4,x+2},{6,NULL}}; p=x; printf(%d,,p-n); printf(%d,p-next-n);}程序运行后的输出结果是(  )。A2,3B2,4C3,4D4,6

单选题
有以下程序:#include main(){ struct node {  int n;  struct node *next; } *p; struct node x[3] = {{2,x+1},{4,x+2},{6,NULL}}; p=x; printf(%d,,p->n); printf(%d,p->next->n);}程序运行后的输出结果是(  )。
A

2,3

B

2,4

C

3,4

D

4,6


参考解析

解析:
序中定义了一个含有三个结构体node元素的数组,数组中元素的next指针分别指向后一个元素,最后一个元素的next指针置为NULL。p指针最初指向x[0],因此p->n=x[0].n=2;即第一次输出2,p->next指向x[1],则p->next->n=x[1].n=4。答案选择B选项。

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