程序代码：

#include<stdio.h>
#include<string.h>
#include<ctype.h>
#include<stdlib.h>
#define N 2
typedef struct stu
{
    char name[10];
    char num[13];
    char sex[4];
    char c;
    float math,chinese,english,sum,comp;
} STD;
void sub(char a[],char e[],int b,int c)
{
    int i;
    for(i=0;i<c;i++)
        e[i]=a[b+i-1];
    e[c]='\0';
}
void menu()
{
    printf("\n\n\n\t\t\t******欢迎使用高考成绩查询系统******\n");
    printf("\t\t\t1.建立学生档案.\n");
    printf("\t\t\t2.查询成绩.\n");
    printf("\t\t\t3.排序.\n");
    printf("\t\t\t4.输出全部学生信息.\n");
    printf("\t\t\t5.退出.\n");
}
int input(STD d[],STD h[])
{
    FILE *fp1,*fp2;
    int i,b=0;
    char n[13],a[3];
    for(i=0;i<N;i++)
    {
        printf("\n\t\t\t请输入第%d名学生信息\n",i+1);
        printf("\t\t\t学号:");
        scanf("%s",n);
        sub(n,a,7,2);
        if(strcmp(a,"01")==0)
        {
            strcpy(d[i].num,n);
            printf("\t\t\t姓名:");
            scanf("%s",d[i].name);
            printf("\t\t\t性别:");
            scanf("%s",d[i].sex);
            printf("\t\t\t语文成绩:");
            scanf("%f",&d[i].chinese);
            printf("\t\t\t数学成绩:");
            scanf("%f",&d[i].math);
            printf("\t\t\t英语成绩:");
            scanf("%f",&d[i].english);
            getchar();
            printf("\t\t\t理综:");
            scanf("%f",&d[i].comp);
            d[i].sum=d[i].chinese+d[i].english+d[i].math+d[i].comp;
            b++;
        }
        else
        {
            strcpy(h[i].num,n);
            printf("\t\t\t姓名:");
            scanf("%s",h[i].name);
            printf("\t\t\t性别:");
            scanf("%s",h[i].sex);
            printf("\t\t\t语文成绩:");
            scanf("%f",&h[i].chinese);
            printf("\t\t\t数学成绩:");
            scanf("%f",&h[i].math);
            printf("\t\t\t英语成绩:");
            scanf("%f",&h[i].english);
            getchar();
            printf("\t\t\t文综:");
            scanf("%f",&h[i].comp);
            h[i].sum=h[i].chinese+h[i].english+h[i].math+h[i].comp;
        }
        system("cls");
    }
    if((fp1=fopen("d:\\daniel.dat","wb"))==NULL)
    {
        printf("\t\t\t错误!\n");
        exit(1);
    }
    if((fp2=fopen("d:\\heddle.dat","wb"))==NULL)
    {
        printf("\t\t\t错误!\n");
        exit(1);
    }
    fwrite(d,sizeof(STD),b,fp1);
    fwrite(h,sizeof(STD),N-b,fp2);
    fclose(fp1);
    fclose(fp2);
    system("cls");
    printf("\n\t\t\t建立成功!\n");
    getch();
    return b;
}

void sort(STD d[],STD h[],int a)
{
    int i,j;
    FILE *fp1,*fp2;
    STD t;
    if((fp1=fopen("d:\\heddle.dat","wb"))==NULL)
        {
            printf("\t\t\t错误!\n");
            exit(1);
        }
    if((fp2=fopen("d:\\daniel.dat","wb"))==NULL)
        {
            printf("\t\t\t错误!\n");
            exit(1);
        }
    for(i=0;i<N-a-1;i++)
        for(j=i+1;j<N-a;j++)
        if(h[i].sum<h[j].sum)
            {
                t=h[i];
                h[i]=h[j];
                h[j]=t;
            }
    for(i=0;i<N-a-1;i++)
        for(j=i+1;j<a;j++)
        if(d[i].sum<d[j].sum)
            {
                t=d[i];
                d[i]=d[j];
                d[j]=t;
            }
    fwrite(h,sizeof(STD),N-a,fp1);
    fwrite(d,sizeof(STD),a,fp2);
    fclose(fp1);
    fclose(fp2);
    getch();
}
void output(STD d[],STD h[],int a)
{
    int i;
    FILE *fp1,*fp2;
    if((fp1=fopen("d:\\heddle.dat","rb"))==NULL)
        {
            printf("\t\t\t错误!\n");
            exit(1);
        }
    fread(h,sizeof(STD),N-a,fp1);
    printf("\n文科\n\n");
    printf("学号\t\t姓名\t语文\t数学\t英语\t文综\t\t总分\n");
    for(i=0;i<N-a;i++)
        printf("%12s\t%6s  %6.1f  %6.1f  %6.1f  %6.1f  \t%6.1f\n",h[i].num,h[i].name,h[i].chinese,h[i].math,h[i].english,h[i].comp,h[i].sum);
    printf("\n\n");
    if((fp2=fopen("d:\\daniel.dat","rb"))==NULL)
        {
            printf("\t\t\t错误!\n");
            exit(1);
        }
    fread(d,sizeof(STD),a,fp2);
    printf("\n理科\n\n");
    printf("学号\t\t姓名\t语文\t数学\t英语\t理综\t\t总分\n");
    for(i=0;i<a;i++)
        printf("%12s\t%6s  %6.1f  %6.1f  %6.1f  %6.1f  \t%6.1f\n",d[i].num,d[i].name,d[i].chinese,d[i].math,d[i].english,d[i].comp,d[i].sum);
    fclose(fp1);
    fclose(fp2);
    getch();
}
void search(STD h[],STD d[],int b)
{
    int i;
    char n[10],m[13],a[3];
    FILE *fp;
    printf("\t\t\t请输入要查询的姓名:");
    scanf("%s",n);
    printf("\t\t\t学号:");
    scanf("%s",m);
    sub(m,a,7,2);
    if(strcmp(a,"01")==0)
    {
        if((fp=fopen("d:\\daniel.dat","rb"))==NULL)
        {
            printf("\t\t\t错误!\n");
            exit(1);
        }
        fread(d,sizeof(STD),b,fp);
        for(i=0;i<b;i++)
            if(strcmp(d[i].name,n)==0 && strcmp(d[i].num,n)==0)
            {
                printf("学号\t\t姓名\t语文\t数学\t英语\t理综\t\t总分\n");
                printf("%12s\t%6s  %6.1f  %6.1f  %6.1f  %6.1f  \t%6.1f\n",d[i].num,d[i].name,d[i].chinese,d[i].math,d[i].english,d[i].comp,d[i].sum);
            }
        if(i>=b)
            printf("\t\t\t查无此人,请核对学生姓名或学号!\n");
    }
    else
    {
        if((fp=fopen("d:\\heddle.dat","rb"))==NULL)
        {
            printf("\t\t\t错误!\n");
            exit(1);
        }
        fread(h,sizeof(STD),N-b,fp);
        for(i=0;i<N-b;i++)
            if(strcmp(h[i].name,n)==0 && strcmp(h[i].num,n)==0)
            {
                printf("学号\t\t姓名\t语文\t数学\t英语\t文综\t\t总分\n");
                printf("%12s\t%6s  %6.1f  %6.1f  %6.1f  %6.1f  \t%6.1f\n",h[i].num,h[i].name,h[i].chinese,h[i].math,h[i].english,h[i].comp,h[i].sum);
            }
        if(i>=N-b)
            printf("\t\t\t查无此人,请核对学生姓名或学号!\n");
    }
    fclose(fp);
    getch();
}
int main(void)
{
    int a,i;
    STD H[N],D[N];
    while(1)
    {
        system("cls");
        menu();
        printf("\t\t\t请输入您的选择:");
        scanf("%d",&a);
        system("cls");
        switch(a)
        {
        case 1:i=input(H,D);break;
        case 2:search(H,D,i);break;
        case 3:sort(H,D,i);printf("\t\t\t排序成功!\n");break;
        case 4:output(H,D,i);break;
        case 5:exit(0);
        default :printf("\t\t\t输入错误!\n");
        }
    }
    return 0;
}