#include<stdio.h>

struct student

{

    char name[];

    char num[];

    char porject[];

    double grade;

};

void main()

{

    int i;student str[];

    for(i=;i<;i++)

    {

        printf("第%d个学生的信息是:\n",i+);

        printf("姓名:");scanf("%s",str[i].name);

        printf("学号:");scanf("%s",str[i].num);

        printf("系别:");scanf("%s",str[i].porject);

        printf("成绩:");scanf("%lf",&str[i].grade);

    }

    for(i=;i<;i++)

    {

        printf("第%d个学生的信息是:\n",i+);

        printf("姓名:%s\n",str[i].name);

        printf("学号:%s\n",str[i].num);

        printf("系别:%s\n",str[i].porject);

        printf("成绩:%lf\n",str[i].grade);

    }

}

#include<stdio.h>

struct student
{

    char sno[];

    char sname[];

    int age;

};

int main()

{

    student class3[];

    int i=,j;

    FILE *fp=fopen("d:\\input.txt","r");

    while(!feof(fp))

return ;

}