5.离散结构-typedef【郝斌数据结构】

预备知识：typedef

例题1：typedef为已有的数据类型重新起个名字

 

 1 # include <stdio.h>
 2 //typedef作用：为已有的数据类型重新起个名字
 3 typedef int ZHANGSAN;//为int再重新多取一个名字，ZHANGSAN等价于int
 4 typedef struct Student//struct Student 为数据类型
 5 {
 6     int sid;
 7     char name[100];
 8     char sex;
 9 }ST;
10 int main(void)
11 {
12     int i=10;//等价于ZHANGSAN i = 10;
13     ZHANGSAN j=20;
14     printf("%d\n", j);
15     struct Student st;//等价于ST st;
16     struct Student * ps = &st;//等价于 ST * ps
17     ps->sid = 300;
18     printf("%d\n", st.sid);
19     ST st2;
20     st2.sid = 200;
21     printf("%d\n", st2.sid);
22     return 0;
23 }

例题2：

 1 # include <stdio.h>
 2 typedef struct Student
 3 {
 4     int sid;
 5     char name[100];
 6     char sex;
 7 }* PST;// PST等价于struct Student *
 8 int main(void)
 9 {
10     struct Student st;
11     PST ps = &st;
12     ps->sid = 99;
13     printf("%d\n", ps->sid);
14     
15     return 0;
16 }

例题3：

 1 # include <stdio.h>
 2 # include <string.h>
 3 typedef struct Student
 4 {
 5     int sid;
 6     char name[100];
 7     char sex;
 8 }* PSTU, STU;// 等价于 STU代表了struct Student, PSTU代表了struct Student *
 9 int main(void)
10 {
11     STU st;//struct Student st
12     PSTU pst = &st;//struct Student * ps = &st;    
13     pst->sid = 99;
14     strcpy(pst->name, "大刀王五");
15     pst->sex = '2';
16     printf("%d %s %c\n", pst->sid, pst->name, pst->sex);
17     return 0;
18 }

 

posted @ 2024-08-27 05:59  java帝国  阅读(6)  评论(0)    收藏  举报