假设有10位同学，各有3门课程的成绩。从键盘输入每位同学的学号、姓名和3门课程的成绩，然后把数据保存到磁盘文件，再将磁盘文件中的学生信息读入并显示

#include<stdio.h>
#include<stdlib.h>
#define N 5
struct student
{
    char sno[10];
    char name[10];
    int grade[3];
};

void write()
{
    FILE *fp;
    struct student s[10];
    int i,j;

    if((fp=fopen("test.txt","w"))==NULL)
    {
        printf("无法打开文件。\n");
        exit(1);
    }

    printf("请输入数据:\n");
    for(i=0;i<N;i++)
    {
        printf("请输入学号:");
        scanf("%s",s[i].sno);
        printf("请输入3门课的成绩:");
        for(j=0;j<3;j++)
            scanf("%d",&s[i].grade[j]);
        printf("请输入姓名:");
        scanf("%s",s[i].name);

    }

    for(i=0;i<N;i++)
        fprintf(fp,"%s %s %d %d %d ",s[i].sno,s[i].name,s[i].grade[0],s[i].grade[1],s[i].grade[2]);
    fclose(fp);

}

void read()
{
    FILE *fp;
    struct student s;
    if((fp=fopen("test.txt","r"))==NULL)
    {
        printf("无法打开文件。\n");
        exit(1);
    }

    printf("学号\t姓名\t语文\t数学\t英语\n");
    while(fscanf(fp,"%s %s %d %d %d",s.sno,s.name,&s.grade[0],&s.grade[1],&s.grade[2])!=EOF)
    {
        printf("%-5s%-10s\t%4d\t%4d\t%4d\n",s.sno,s.name,s.grade[0],s.grade[1],s.grade[2]);
    }

    fclose(fp);
}

void main()
{
    write();
    read();

}