#include<stdio.h>
//typedef 为数据类型重命名
typedef struct Student {
int age;
int id;
char name[20];
}* PSTU , STU;//PSTU等价于struct Student*类型,STU等价于struct Student类型
int main() {
STU st; //相当于struct Student st;
PSTU pst = &st; //相当于struct Student* pst;
pst->id = 99;
printf("%d", pst->id);
return 0;
}