为什么a=20,b=21,*p=20,*q=21呀

因为 经过几步处理q指向a;所以经过 *q = 20,所以a = 20, b = *q + 1;所以为21
p = &b;p指向b,所以为21

所以a = 20, b = 21, *p = 21, *q = 20