以下程序运行时,输出到屏幕的结果中第一行是__(16)___,第三行是___(17)___,第四行是___(18)___ 。#includestruct n{ int x; char c;};void fun(struct n *b) {b++->x=20;b->c=’y’; } int main() {struct n a[2]={10,’x’};fun (a);printf("%d\n%c\n%d\n%c\n",a[0].x,a[0].c,a[1].x,a[1].c);return 0; }