链表嵌套实现一个年级内各班级学生语文、数学和英语成绩录入，寻找出一个年级内学生三科总分的最高分、最低分以及平均分。

思路：使用头插法创建一个学生的链表，节点个数便是学生人数。使用同样的方法创建班级的链表，每一个班级中包含该班学生的链表头。最后遍历两个链表打印数据。

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代码如下：

#include <stdio.h>
#include <stdlib.h>/**********定义结构体**********/
struct class
{struct student *st;struct class *next;
};struct student
{int yuwen;int shuxue;int yingyu;int add;struct student *next;
};/**********头插法创建学生链表**********/
struct student* insertSt(struct student *head,int i)
{struct student *new = head;new = (struct student *)malloc(sizeof(struct student));printf("第%d名同学语文成绩：\n",i+1);scanf("%d",&(new->yuwen));printf("第%d名同学数学成绩：\n",i+1);scanf("%d",&(new->shuxue));printf("第%d名同学英语成绩：\n",i+1);scanf("%d",&(new->yingyu));new->add = (new->yuwen)+(new->shuxue)+(new->yingyu);	if(head == NULL){head = new;return head;}else{new->next = head;head = new;return head;}return head;
}struct student* inputSt()
{int i,num;printf("请输入该班人数：");scanf("%d",&num);struct student *st = NULL;for(i=0;i<num;i++){st=insertSt(st,i);}return st;
}/**********头插法创建班级链表**********/
struct class* insertCl(struct class *head,int i)
{struct student *st = NULL;struct class *new = NULL;new = (struct class *)malloc(sizeof(struct class));printf("输入%d班成绩：\n",i+1);st = inputSt(st);new->st = st;if(head == NULL){head = new;return head;}else{new->next = head;head = new;return head;}return head;
}struct class* inputCl()
{int i,ban;printf("请输入班级数目：\n");scanf("%d",&ban);struct class *cl = NULL;for(i=0;i<ban;i++){cl=insertCl(cl,i);putchar('\n');}return cl;
}/**********输出打印结果**********/
void printFen(struct class *cl)
{int i=0;int max = cl->st->add;int min = max;float ave = 0;while(cl != NULL){while(cl->st != NULL){if(max < cl->st->add){max = cl->st->add;}if(min > cl->st->add){min = cl->st->add;}ave =(float) ave+cl->st->add;++i;cl->st = cl->st->next;}cl = cl->next;}ave =(float)ave/i;printf("年级总分最高分：%d\n",max);printf("年级总分最低分：%d\n",min);printf("年级总分平均分：%f\n",ave);
}	int main()
{	struct class *cl=NULL;cl = inputCl();printFen(cl);return 0;
}

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运行程序：