| 帮我编写一个C语言动态链表代码，用于学生成绩管理系统，功能有在特定位置插入，添加，删除，输出，查找，按成绩大晓小输出等功能

好的，以下是一个简单的C语言动态链表代码，用于学生成绩管理系统：

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

typedef struct student {
    char name[20];
    int score;
    struct student *next;
} Student;

Student *create() {
    Student *head = (Student *)malloc(sizeof(Student));
    head->next = NULL;
    return head;
}

void insert(Student *head, int pos, char *name, int score) {
    Student *p = head;
    int i = 0;
    while (p && i < pos - 1) {
        p = p->next;
        i++;
    }
    if (!p || i > pos - 1) {
        printf("插入位置不合法\n");
        return;
    }
    Student *new_node = (Student *)malloc(sizeof(Student));
    strcpy(new_node->name, name);
    new_node->score = score;
    new_node->next = p->next;
    p->next = new_node;
}

void add(Student *head, char *name, int score) {
    Student *p = head;
    while (p->next) {
        p = p->next;
    }
    Student *new_node = (Student *)malloc(sizeof(Student));
    strcpy(new_node->name, name);
    new_node->score = score;
    new_node->next = NULL;
    p->next = new_node;
}

void del(Student *head, int pos) {
    Student *p = head;
    int i = 0;
    while (p->next && i < pos - 1) {
        p = p->next;
        i++;
    }
    if (!p->next || i > pos - 1) {
        printf("删除位置不合法\n");
        return;
    }
    Student *del_node = p->next;
    p->next = del_node->next;
    free(del_node);
}

void output(Student *head) {
    Student *p = head->next;
    while (p) {
        printf("%s %d\n", p->name, p->score);
        p = p->next;
    }
}

void search(Student *head, int score) {
    Student *p = head->next;
    while (p) {
        if (p->score == score) {
            printf("%s %d\n", p->name, p->score);
        }
        p = p->next;
    }
}

void sort(Student *head) {
    int len = 0;
    Student *p = head->next;
    while (p) {
        len++;
        p = p->next;
    }
    for (int i = 0; i < len - 1; i++) {
        p = head->next;
        for (int j = 0; j < len - i - 1; j++) {
            if (p->score > p->next->score) {
                int temp_score = p->score;
                p->score = p->next->score;
                p->next->score = temp_score;
                char temp_name[20];
                strcpy(temp_name, p->name);
                strcpy(p->name, p->next->name);
                strcpy(p->next->name, temp_name);
            }
            p = p->next;
        }
    }
}

int main() {
    Student *head = create();
    int choice, pos, score;
    char name[20];
    while (1) {
        printf("1.插入 2.添加 3.删除 4.输出 5.查找 6.排序 7.退出\n");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                printf("请输入插入位置和学生姓名、成绩：\n");
                scanf("%d %s %d", &pos, name, &score);
                insert(head, pos, name, score);
                break;
            case 2:
                printf("请输入学生姓名、成绩：\n");
                scanf("%s %d", name, &score);
                add(head, name, score);
                break;
            case 3:
                printf("请输入删除位置：\n");
                scanf("%d", &pos);
                del(head, pos);
                break;
            case 4:
                output(head);
                break;
            case 5:
                printf("请输入查找成绩：\n");
                scanf("%d", &score);
                search(head, score);
                break;
            case 6:
                sort(head);
                output(head);
                break;
            case 7:
                exit(0);
            default:
                printf("输入错误，请重新输入\n");
                break;
        }
    }
    return 0;
}

这个代码实现了在特定位置插入、添加、删除、输出、查找、按成绩大小排序等功能。