个人认为对于初学者很有帮助

#include<stdio.h>
#include<stdlib.h>
#include<string.h>


typedef struct student{
    char name[100];
    int score;
    struct student *next;
}ss;
void creat(ss* head,int n)
{
    int i;
    ss* p1;
    p1=head;
    for(i=0;i<n;i++)
    {
        p1->next=(ss*)malloc(sizeof(ss));
        printf("请输入第%d个学生的分数和姓名\n",i+1);
        scanf("%d",&p1->next->score);
        getchar();
        scanf("%s",p1->next->name);
        p1=p1->next;
    }
    p1->next=NULL;
}


void add(ss* head,int n)
{
    int loca;
    ss* p1,*p2,*p3;
    printf("请输入你要添加学生的位置\n");
    scanf("%d",&loca); 
    p1=head;
    p2=p1->next;
    while(--loca)
    {
        p1=p1->next;
        p2=p2->next;
    }
    printf("请输入该学生的分数和姓名\n");
    p3=(ss*)malloc(sizeof(ss));
    scanf("%d",&p3->score);
    getchar();
    scanf("%s",p3->name);
    p1->next=p3;
    p3->next=p2;
}


void delet(ss* head,int n)
{
    ss* p1,*p2;
    int j; 

    printf("请输入准备删除的位置\n");
    scanf("%d",&j);
    p1=head;
    p2=p1->next;
    while(--j)
    {
        p1=p1->next;
        p2=p2->next;
    }
        p2=p2->next;
        p1->next=p2;

}


void find(ss* head,int n)
{
    ss* p1;
    char a[10];
    int d; 
    p1=head->next;
    printf("请输入你想发现这个同学的名字\n");
    scanf("%s",a);

    while(p1)
    {
        d=strcmp(p1->name,a)+1;
        if(d==1)
        {
            printf("该同学的信息如下：\n");
            printf("姓名：%s\t分数： %d\n",p1->name,p1->score);
            break;
        }
        p1=p1->next;

    }
}


void change(ss* head,int n)
{
    ss* p1;
    int j; 

    p1=head;
    printf("请输入准备改变的位置\n");
    scanf("%d",&j);
    while(j--)
    {
        p1=p1->next;
    }
    printf("请输入该学生的分数和姓名\n");
    scanf("%d",&p1->score);
    getchar();
    scanf("%s",p1->name);

}


void show(ss* head,int n)
{
    int j=0;
    ss* p1;
    p1=head;
    while(p1->next)
    {
        p1=p1->next;
        printf("第%d个学生",j+1);
        printf("\t%s\t%d",p1->name,p1->score);
        j++;
        printf("\n");
    }

}


void free(ss* head,int n)
{
    ss* p1;
    p1=head;
    while(p1->next)
    {
    p1=p1->next;
     free(p1);
    }
}


int main()
{
    int n,i=100;
    ss* head,*p1;
    printf("请输入学生数：\n");
    scanf("%d",&n);

    head=(ss*)malloc(sizeof(ss));
    creat(head,n);

    while(i)
    {
        printf("请输入你要执行的操作<<完成操作请输入 0 >>\n");
        printf("1:添加\n2:删除\n3:查找\n4：改变\n");
        scanf("%d",&i);
        switch(i)
        {
        case 1 :
                    add(head,n);break;
        case 2 :
                    delet(head,n);break;
        case 3 :
                    find(head,n);break;
        case 4 :
                    change(head,n);break;
        }
        if(i==0)
        {
                break;
        }
    }
    show(head,n);
    free(head,n);
    return 0;
}