学生成绩等级统计

设有如下结构体：
struct student 
{
 int num;
 char name[10];
 int grade;
}
按学生成绩等级将学生信息添加到相应等级的链表中。

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
#define N 13
extern unsigned _floatconvert;    /*防止floating point formats not linked 错误发生*/
#pragma extref _floatconvert

typedef struct student    
{
    int num;
    char name[10];
    int grade;
}Stu;

Stu stu[N]={{2,"Lin",92},
            {3,"Zhang",87},
            {4,"Zhao",72},
            {5,"Ma",91},
            {9,"Zhen",85},
            {11,"Wang",100},
            {12,"Li",86},
            {13,"Xu",83},
            {16,"Mao",78},
            {17,"Hao",95},
            {20,"Lu",82},
            {21,"Song",76},
            {22,"Wu",88}};
typedef struct node
{
    Stu *data;
    struct node *next;
}Node;

void show(Node *h)
{
    Node *p;
    p=h;
    while(p->next!=NULL)
    {
        printf("%d\t%s\t%d\n",p->data->num,p->data->name,p->data->grade);
        p=p->next;
    }
}

void save(Node *h,Stu *p)
{
    Node *s,*t;
    s=(Node *)malloc(sizeof(Node));
    t=h;
    while(t->next!=NULL) t=t->next;
    s->data=p;
    s->next=NULL;
    t->next=s;
}

void main()
{
    int i,j,k,flag[4]={0};
    Node *h[4]={NULL},*p;
    for(i=0;i<N;i++)
        for(j=1;j<4;j++)
        {
            k=10-int(stu[i].grade/10);
            if(k==0) k++;
            if(k==j)
                if(flag[j]==0)
                {
                    flag[j]=1;
                    p=(Node *)malloc(sizeof(Node));
                    h[j]=p;
                    p->data=&stu[i];
                    p->next=NULL;
                }
                else
                    save(h[j],&stu[i]);
        }
    for(i=1;i<4;i++)
    {
        printf("The NO.%d table:\n",i);
        show(h[i]);
    }
    getch();
}