c语言根据公告中发布参考文献，构建5个学生构成链表，完成插入，删除和遍历链表元素的功能。 struct Student{ int num； char name[20]; float score; }

在C语言中，为了实现一个包含5个学生的链表结构，并提供插入、删除和遍历功能，你需要首先定义`Student`结构体和一个节点结构`Node`，然后创建链表头指针。以下是关键步骤：

1. **定义结构体**:

struct Node {
    struct Student student;
    struct Node *next; // 指向下一个节点的指针
};

struct Student {
    int num;
    char name[20];
    float score;
};

2. **初始化链表**:

struct Node* head = NULL; // 初始链表为空

3. **插入操作**:
- 插入到头部:

void insertAtStart(struct Node** head, struct Student newStudent) {
    struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
    newNode->student = newStudent;
    newNode->next = *head;
    *head = newNode;
}

- 插入到指定位置:

void insertAtPosition(struct Node** head, int position, struct Student newStudent) {
    if (position <= 0) return; // 防止越界
    struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
    newNode->student = newStudent;
    newNode->next = NULL;

    if (*head == NULL || position == 1) {
        newNode->next = *head;
        *head = newNode;
        return;
    }

    struct Node* current = *head;
    for (int i = 1; i < position - 1 && current != NULL; ++i) {
        current = current->next;
    }
    if (current != NULL)
        newNode->next = current->next;
    current->next = newNode;
}

4. **删除操作**:
- 删除头部节点:

void deleteFromStart(struct Node** head) {
    if (*head != NULL) {
        struct Node* temp = *head;
        *head = (*head)->next;
        free(temp);
    }
}

// 删除指定位置节点
void deleteFromPosition(struct Node** head, int position) {
    if (*head == NULL || position <= 0) return;
    if (position == 1) {
        deleteFromStart(head);
        return;
    }

    struct Node* current = *head;
    for (int i = 1; i < position && current != NULL; ++i) {
        current = current->next;
    }
    if (current == NULL) return;

    struct Node* temp = current->next;
    current->next = temp->next;
    free(temp);
}

5. **遍历链表**:

void traverseList(struct Node* head) {
    if (head == NULL) {
        printf("链表为空.\n");
    } else {
        struct Node* temp = head;
        while (temp != NULL) {
            printf("学号: %d, 姓名: %s, 成绩: %.2f\n", temp->student.num, temp->student.name, temp->student.score);
            temp = temp->next;
        }
    }
}

使用以上函数时，记得处理内存分配失败的情况。现在你可以根据需要构造和管理这个学生链表了。