/*例一
#include <stdio.h>
typedef int GJG;//typedef 作用相当于把int替换成GJG，即GJG就相当于int
typedef struct Student
{
    int sid;
    char sex;
    char name[100];

}St;//相当于把结构体struct Student替换成为结构体St；
int main()
{

    //int i=10;
    //GJG j=20;
    //printf("%d\n",j);//验证GJG等价于int


    struct Student st;//  相当于 St st;
    struct Student *ps=&st;// 相当于 St *ps=&st;
    St st2;// 相当于 struct Student st2;
    st2.sid=200;
    printf("%d\n",st2.sid);
    return 0;
}
*/


/*例二
#include<stdio.h>
typedef struct Student
{
    int sid;
    char name[100];
    char sex;

}* PST;//PST等价于struct Student *类型；
int main()
{
    struct Student st;
    PST ps=&st;//相当于 struct Student * ps =&st;ps为指针变量
    ps->sid=99;
    printf("%d\n",ps->sid);
    return 0;
}
*/


//例三
#include<stdio.h>
typedef struct Student
{
    int sid;
    char name[100];
    char sex;

}* PSTU,STU;//等价于 PSTU代表了struct Student *  // STU代表了struct Student
int main()
{
    STU st;// 等价于 struct Student st;
    PSTU ps=&st;// 等价于 struct Student *ps=&st;
    ps->sid=99;
    printf("%d\n",ps->sid);

    return 0;

}