C/C++ 结构体 指针 简单输入输出

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 
 4 struct student{
 5     int num;
 6     char str[20];
 7     double dec;
 8 };
 9 
10 int main(){
11     int n;
12     struct student *stu;
13 
14     scanf("%d", &n);
15     stu = (struct student *)malloc(n * sizeof(struct student));
16 
17     for(int i = 0; i < n; ++i){
18         scanf("%d%s%lf", &stu[i].num, stu[i].str, &stu[i].dec);
19     }
20     
21     printf("%d\n", n);
22     for(int i = 0; i < n; ++i){
23         printf("%d %s %lf\n", stu[i].num, stu[i].str, stu[i].dec);
24     }
25 
26     free(stu);
27     return 0;
28 }
29 /*
30 3
31 20 字符串0 20.02
32 21 字符串1 21.12
33 22 字符串2 22.22
34 */