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

typedef struct student
{
    double id;
    char name[50];
    int score[3];
    int ave;
    int sum;
}STU;
STU s[48];
STU t;
int main()
{
    FILE * fp;
    int i,j,max;
    if((fp=fopen("stud.txt","r"))==NULL)           //读取原始数据
    {
        printf("Can not open the file !!!\n");
        exit(0);
    }
    for(i=0;i<48;i++)                              //原始数据暂存结构体
    {
        fscanf(fp,"%lf%s%d%d%d",&s[i].id,s[i].name,&s[i].score[0],&s[i].score[1],&s[i].score[2]);
        s[i].ave=(s[i].score[0]+s[i].score[1]+s[i].score[2])/3;
        s[i].sum=s[i].score[0]+s[i].score[1]+s[i].score[2];
    }
    fclose(fp);
    for(i=0;i<48;i++)
    {
        printf("%.0f\t%s\t%d\t%d\t%d\t%d\t%d\n",s[i].id,s[i].name,s[i].score[0],s[i].score[1],s[i].score[2],s[i].ave,s[i].sum);
    }



    if((fp=fopen("stud.dat","wb"))==NULL)                   //数据存储二进制文件
    {
        printf("Can not open the file stud.dat!!\n");
        exit(0);
    }
    fwrite(s,sizeof(STU),48,fp);
    fclose(fp);
    for(i=0;i<47;i++)
    {
        max=i;
        for(j=i+1;j<48;j++)
        {
            if(s[max].sum<s[j].sum)
                max=j;
        }
        t=s[i];
        s[i]=s[max];
        s[max]=t;
    }


    if((fp=fopen("score_sorted.txt","w"))==NULL)            // 总成绩排序存储文件
    {
        printf("Can not open the file score_sorted.txt!!!\n");
        exit(0);
    }
    for(i=0,j=1;i<48;i++,j++)
    {
        fprintf(fp,"%d\t\t%.0f\t%s\t%d\t%d\t%d\t%d\t%d\n",j,s[i].id,s[i].name,s[i].score[0],s[i].score[1],s[i].score[2],s[i].ave,s[i].sum);
    }
    if((fp=fopen("score_sorted.dat","wb"))==NULL)                   //二进制文件
    {
        printf("Can not open the file score_sorted.dat!!\n");
        exit(0);
    }
    fwrite(s,sizeof(STU),48,fp);
    fclose(fp);


    if((fp=fopen("Chinese_sorted.txt","w"))==NULL)          //语文成绩排序存储文件
    {
        printf("Can not open the file Chinese_sorted.txt!!!\n");
        exit(0);
    }
    for(i=0;i<47;i++)
    {
        max=i;
        for(j=i+1;j<48;j++)
        {
            if(s[max].score[0]<s[j].score[0])
                max=j;
        }
        t=s[i];
        s[i]=s[max];
        s[max]=t;
    }
    for(i=0,j=1;i<48;i++,j++)
    {
        fprintf(fp,"%d\t\t%.0f\t%s\t%d\t%d\t%d\t%d\t%d\n",j,s[i].id,s[i].name,s[i].score[0],s[i].score[1],s[i].score[2],s[i].ave,s[i].sum);

    }
    if((fp=fopen("Chinese_sorted.dat","wb"))==NULL)                   //二进制文件
    {
        printf("Can not open the file Chinese_sorted.dat!!\n");
        exit(0);
    }
    fwrite(s,sizeof(STU),48,fp);
    fclose(fp);


    if((fp=fopen("Math_sorted.txt","w"))==NULL)            //数学成绩排序存储文件
    {
        printf("Can not open the file Math_sorted.txt!!!\n");
        exit(0);
    }
    for(i=0;i<47;i++)
    {
        max=i;
        for(j=i+1;j<48;j++)
        {
            if(s[max].score[1]<s[j].score[1])
                max=j;
        }
        t=s[i];
        s[i]=s[max];
        s[max]=t;
    }
    for(i=0,j=1;i<48;i++,j++)
    {
        fprintf(fp,"%d\t\t%.0f\t%s\t%d\t%d\t%d\t%d\t%d\n",j,s[i].id,s[i].name,s[i].score[0],s[i].score[1],s[i].score[2],s[i].ave,s[i].sum);

    }
    if((fp=fopen("Math_sorted.dat","wb"))==NULL)                   //二进制文件
    {
        printf("Can not open the file Math_sorted.dat!!\n");
        exit(0);
    }
    fwrite(s,sizeof(STU),48,fp);
    fclose(fp);


    if((fp=fopen("English_sorted.txt","w"))==NULL)          //英语成绩排序存储文件
    {
        printf("Can not open the file English_sorted.txt!!!\n");
        exit(0);
    }
    for(i=0;i<47;i++)
    {
        max=i;
        for(j=i+1;j<48;j++)
        {
            if(s[max].score[2]<s[j].score[2])
                max=j;
        }
        t=s[i];
        s[i]=s[max];
        s[max]=t;
    }
    for(i=0,j=1;i<48;i++,j++)
    {
        fprintf(fp,"%d\t\t%.0f\t%s\t%d\t%d\t%d\t%d\t%d\n",j,s[i].id,s[i].name,s[i].score[0],s[i].score[1],s[i].score[2],s[i].ave,s[i].sum);

    }
    if((fp=fopen("English_sorted.dat","wb"))==NULL)                   //二进制文件
    {
        printf("Can not open the file English_sorted.dat!!\n");
        exit(0);
    }
    fwrite(s,sizeof(STU),48,fp);
    fclose(fp);



    double N;
    char M[20];
    int a;
    printf("Please put in the the student's ID and the subject(Chinese or Math or English or Total) that you want to have a look:\n");
    scanf("%lf",&N);
    scanf("%s",M);
    getchar();
                if((fp=fopen(M,"r"))==NULL)
                {
                    printf("Can not open the file %s!!!\n",M);
                    exit(0);
                }
            for(i=0;i<48;i++)
                {
                    fscanf(fp,"%d\t\t%lf%s%d%d%d%d%d",&a,&t.id,t.name,&t.score[0],&t.score[1],&t.score[2],&t.ave,&t.sum);
                    if(N==t.id)
                    {
                        printf("%d\t\t%.0f\t%s\t%d\t%d\t%d\t%d\t%d\n",a,t.id,t.name,t.score[0],t.score[1],t.score[2],t.ave,t.sum);
                        break;
                    }

                }

            fclose(fp);

    return 0;
}

加入那些语句后所有通过这个程序生成的文件全部没有了内容