c语言学生成绩管理系统源代码，要求使用链表

以下是一个简单的使用链表实现的C语言学生成绩管理系统的源代码，仅供参考：

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

#define MAX_NAME_LEN 20

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

Student *head = NULL;

void add_student() {
    Student *new_student = (Student*)malloc(sizeof(Student));
    printf("请输入学生姓名：");
    scanf("%s", new_student->name);
    printf("请输入学生成绩：");
    scanf("%d", &(new_student->score));
    new_student->next = NULL;
    if (head == NULL) {
        head = new_student;
    } else {
        Student *ptr = head;
        while (ptr->next != NULL) {
            ptr = ptr->next;
        }
        ptr->next = new_student;
    }
    printf("添加成功！\n");
}

void print_students() {
    if (head == NULL) {
        printf("没有学生记录！\n");
        return;
    }
    printf("姓名\t成绩\n");
    Student *ptr = head;
    while (ptr != NULL) {
        printf("%s\t%d\n", ptr->name, ptr->score);
        ptr = ptr->next;
    }
}

void search_student() {
    if (head == NULL) {
        printf("没有学生记录！\n");
        return;
    }
    char name[MAX_NAME_LEN];
    printf("请输入要查找的学生姓名：");
    scanf("%s", name);
    Student *ptr = head;
    while (ptr != NULL) {
        if (strcmp(ptr->name, name) == 0) {
            printf("%s的成绩是%d\n", name, ptr->score);
            return;
        }
        ptr = ptr->next;
    }
    printf("没有找到%s的记录！\n", name);
}

void delete_student() {
    if (head == NULL) {
        printf("没有学生记录！\n");
        return;
    }
    char name[MAX_NAME_LEN];
    printf("请输入要删除的学生姓名：");
    scanf("%s", name);
    if (strcmp(head->name, name) == 0) {
        Student *temp = head;
        head = head->next;
        free(temp);
        printf("删除成功！\n");
        return;
    }
    Student *ptr = head;
    while (ptr->next != NULL) {
        if (strcmp(ptr->next->name, name) == 0) {
            Student *temp = ptr->next;
            ptr->next = temp->next;
            free(temp);
            printf("删除成功！\n");
            return;
        }
        ptr = ptr->next;
    }
    printf("没有找到%s的记录！\n", name);
}

int main() {
    while (1) {
        printf("请选择要执行的操作：\n");
        printf("1.添加学生\n");
        printf("2.显示所有学生\n");
        printf("3.查找学生\n");
        printf("4.删除学生\n");
        printf("5.退出程序\n");
        int choice;
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_student();
                break;
            case 2:
                print_students();
                break;
            case 3:
                search_student();
                break;
            case 4:
                delete_student();
                break;
            case 5:
                exit(0);
            default:
                printf("无效的选择，请重新输入！\n");
        }
    }
    return 0;
}

这个学生成绩管理系统使用链表来存储学生记录，可以动态添加、查找和删除学生记录，并可以显示所有学生记录。用户可以通过命令行菜单来选择要执行的操作。