typedef的用法

# include <stdio.h>

typedef struct Student  //给数据类型重新定义个名字为 ST
{
    int sid ;
    char name;
}ST;

typedef struct Student  //给数据类型重新定义个名字为 ST
{
    int sid ;
    char name;
}* ST;        //等价于 struct Student * st

typedef struct Student  //给数据类型重新定义个名字为 ST
{
    int sid ;
    char name;
}* ST ,SU;        //ST 等价于 struct Student * st, SU 等价于struct Student st

int main(void)
{
    ST st; //等价于 struct Student st
}