1.建立一个包含10个学生的链表
  1）输出链表
    2）增加一名学生
    3）删除成绩不及格的学生

#include<stdio.h>
#include<malloc.h>
#define N 5
#define LEN sizeof(struct student)

struct student
{
    char num[6];
    char name[8];
    char sex[2];
    int age;
    //char kemu[14];
    //float score;
    struct student *next;
}stu[N];

void main()
{   
    struct student *p,*pt,*head;
    int i,length,iage,flag=1;
    int find=0;
    while(flag==1)
    {
        printf("Please input length of list(<10):");
        scanf("%d",&length);
        if(length<10)
            flag=0;
    }
    for( i=0; i<length; i++ )
    {
        p=(struct student *)malloc(LEN);
        if(i==0)
            head=pt=p;
        else
            pt->next=p;
        pt=p;
        printf("No:");
        scanf("%s",p->num);

        printf("Name:");
        scanf("%s",p->name);

        printf("Sex:");
        scanf("%s",p->sex);

        printf("Age:");
        scanf("%d",&p->age);
    }

    p->next=NULL;
    p=head;
    printf("\nNo\tName\tSex\tAge\n");
    while(p!=NULL)
    {
        printf("%4s%8s%6s%6d\n",p->num,p->name,p->sex,p->age);
        p=p->next;
    }

    printf("Please input age:\t");
    scanf("%d",&iage);
   
    pt=head;
    p=pt;
    if(pt->age==iage)
    {
        p=pt->next;
        head=pt=p;
        find=1;
    }
    else
        pt=pt->next;

    while(pt!=NULL)
    {
        if(pt->age==iage)
        {
            p->next=pt->next;
            find=1;
        }
        else
            p=pt;
            pt=pt->next;
    }

    if(!find)
        printf("Sorry! No find%d",iage);
   
    p=head;
    printf("\nNo\tName\tSex\tAge\n");
    while(p!=NULL)
    {
        printf("%4s%8s%6s%6d\n",p->num,p->name,p->sex,p->age);
        p=p->next;
    }
   
}
着我做的链表！
跟你的差不多！
你参考一下！