c结构体指针使用

Posted 2020-11-09 老鼠扛刀，满街找猫

 1 #include <stdio.h>
 2 #include<stdlib.h>
 3 #include<string.h>
 4 
 5 typedef struct _Date
 6 {
 7     unsigned int Year;
 8     unsigned int Month;
 9     unsigned int Day;
10 }Date;
11 
12 int main(int a,char** b)
13 {
14     Date * date1;
15     int back;
16     date1=malloc(sizeof(Date));
17     date1->Year=2018;
18     date1->Month=5;
19     date1->Day=31;
20     back=Change(date1);
21     printf("back is :%d\n",back);
22     printf("date is :%d,%d,%d\n",date1->Year,date1->Month,date1->Day);
23     date1->Year=0;
24     date1->Month=0;
25     date1->Day=0;
26     free(date1);
27     return 0;
28 }
29 
30 int Change (Date * date)
31 {
32     int back;
33     back=date->Year+date->Month+date->Day;
34     date->Year=1;
35     date->Month=2;
36     date->Day=3;
37     return back;
38 }

结果：

root:/opt/rwh# ./b
back is :2054
date is :1,2,3
root:/opt/rwh#