单选题 struct stu{ int x; int *y;} *p;int dt[4] = {10, 20, 30, 40};struct stu a[4] = {50, &dt[0], 60, &dt[1], 70, &dt[2], 80, &dt[3]}; int main( ){ p=a; printf("%d,", ++p->x); printf("%d,", (++p)->x); printf("%d", ++(*p->y)); return 0;}