C/C++ 结构体 简单输入输出

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

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

 int main(){

     struct student stu;

     scanf("%d%s%lf", &stu.num, stu.str, &stu.dec);
     printf("%d %s %lf\n", stu.num, stu.str, stu.dec);

     return ;
 }
 /*
 20 字符串 20.02
 */