有以下程序(strcat函数用于连接两个字符串)：
#include ＜stdio.h＞
#include ＜string.h＞
main()
char a[20]="ABCD\0EFG\0",b[]="IJK";
strcat(a,b);printf("%s\n" ,a);

程序运行后的输出结果是

A) *pt->y
B) pt->x
C) ++pt->x
D) (pt++)->x

A) struct ord int x;int y;int z;;struct ord a;
B) struct ord int x;int y;int z; struct ord a;
C) struct ord int x;int y;int z; a;
D) struct int x;int y;int z;a;