C/C++ 结构体 指针 简单输入输出

 #include <stdio.h>
 #include <stdlib.h>

 struct student{
     int num;
     char str[];
     double dec;
 };

 int main(){
     int n;
     struct student *stu;

     scanf("%d", &n);
     stu = (struct student *)malloc(n * sizeof(struct student));

     for(int i = ; i < n; ++i){
         scanf("%d%s%lf", &stu[i].num, stu[i].str, &stu[i].dec);
     }

     printf("%d\n", n);
     for(int i = ; i < n; ++i){
         printf("%d %s %lf\n", stu[i].num, stu[i].str, stu[i].dec);
     }

     free(stu);
     return ;
 }
 /*
 3
 20 字符串0 20.02
 21 字符串1 21.12
 22 字符串2 22.22
 */