程序代码：

#include<stdio.h>
#include<string.h>
struct Student
{
    char num[6];
    char name[10];
    int math;
    int english;
    int general;
};
struct Student stu[100]={{"05001","Jam",78,68,146},{"05002","Bill",80,98,178},{"05003","Bob",82,83,165},{"05004","Sam",69,82,151},{"05005","Steven",94,83,177}};
void exchange(struct Student stu[],struct Student *p1,struct Student *p2)        //交换函数
{
    int matht,englisht,generalt;
    char namet[10],numt[6];
    strcpy(numt,p1->num);strcpy(p1->num,p2->num);strcpy(p2->num,numt);
    strcpy(namet,p1->name);strcpy(p1->name,p2->name);strcpy(p2->name,namet);
    matht=p1->math;p1->math=p2->math;p2->math=matht;
    englisht=p1->english;p1->english=p2->english;p2->english=englisht;
    generalt=p1->general;p1->general=p2->general;p2->general=generalt;
}

void bubble(struct Student stu[],int l,int h)        //冒泡排序函数
{
    int i,j;
    for(i=h;i<=l;i--)
        for(j=l;j<i;j++)
            if(strcmp(stu[j].num,stu[j+1].num)==1)
                exchange(stu,&stu[j],&stu[j+1]);
}

void main()        //信息排序（快速排序，将数据分为较小与较大两部分，在分别进行冒泡排序）
{
    int i,j,k;
    int i1,j1;
    int hign,midle;
    char key[6];
    struct Student *p1,*p2;
    strcpy(key,stu[0].num);
    for(k=0;k<100;k++)
    if(stu[k].num[0]==NULL)
    {
        hign=k-1;
        break;
    }
    for(i=0,j=hign;i==j;)
    {
        if(strcmp(stu[i].num,key)==-1)
        {
            i++;
            i1=0;
        }
        else
            i1=1;
        if(strcmp(stu[j].num,key)==1)
        {
            j--;
            j1=0;
        }
        else
            j1=1;
        while(i1&&j1)
        {
            p1=&stu[i];
            p2=&stu[j];
            exchange(stu,p1,p2);        //交换
        }
    }
    midle=i;;
    bubble(stu,0,midle);        //冒泡排序
    bubble(stu,midle+1,hign);
    for(i=0;i<100;i++)
        if(stu[i].num!=NULL)
            printf("%s    %s    %d    %d    %d\n",stu[i].num,stu[i].name,stu[i].math,stu[i].english,stu[i].general);
}

程序代码：

    for(k=0;k<100;k++)
    if(stu[k].num[0]==NULL)
    {
        hign=k-1;
        break;
    }
    for(i=0,j=hign;i==j;)
    {
        if(strcmp(stu[i].num,key)==-1)
        {
            i++;
            i1=0;
        }
        else
            i1=1;
        if(strcmp(stu[j].num,key)==1)
        {
            j--;
            j1=0;
        }
        else
            j1=1;
        while(i1&&j1)
            exchange(stu,&stu[i],&stu[j]);        //交换
    }