数据结构单链表创建，插入，修改，遍历，查找以及删除，销毁（附源文件）

代码源文件
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结构体定义标题

typedef struct inform    //数据域结构体
{
    char name[20];
    char num[20];
    int score[3];
}DATA;

typedef struct Node    //节点结构体
{
    DATA data;    //数据域
    struct Node *next;     //指针域
}Node;

头节点创建

/头节点创建
Node* list_create(DATA data)
{
    Node* head = (Node*)malloc(sizeof(Node));
    if(head == NULL)
    {
        printf("内存申请失败!\n");
        return NULL;
    }
    head->data = data;
    head->next = NULL;
    return head;
}

头插法

//头插法
Node* list_addhead(Node* head,DATA data)
{
    if(head == NULL)
    {
        return list_create(data);
    }
    Node* p = (Node*)malloc(sizeof(Node));
    if(p == NULL)
    {
        printf("内存申请失败!\n");
        return head;   //创建失败，返回原来头节点指针
    }
    p->data = data;    //结构体之间可以直接相互赋值 
    p->next = head;
    head = p;
    return head;

}

尾插法

//尾插法
Node* list_addtail(Node* head,DATA data)
{
    Node *p = head;
    if(head == NULL)
    {
        return list_create(data);
    }
    
    Node* tail = (Node*)malloc(sizeof(Node));
    if(tail == NULL)
    {
        printf("内存申请失败!\n");
        return head;  //创建失败，返回原来头节点指针
    }
    tail->data = data;
    tail->next = NULL;
    
    while(p->next != NULL)
    {
        p = p->next;
    }
    p->next = tail;
    return head;
}


Node* list_addtail_v2(Node* head,DATA data)   
{
    Node* pNew = (Node*)malloc(sizeof(Node));
    if(pNew == NULL)
    {
        printf("内存申请失败!\n");
        return head;  //创建失败，返回原来头节点指针
    }
    pNew->data = data;
    pNew->next = NULL;
    
    Node* p = head, *q;
    while(p != NULL)
    {
        q = p;
        p = p->next;
    }
    if(head != NULL)
    {
        q->next = pNew;    
    }
    else
    {
        head = pNew;
    }
    return head;
}

查找(姓名)删除

//查找(姓名)删除
Node* list_delete(Node* head, char* ch)  
{
    if(head == NULL)
    {
        return NULL;
    }
    Node* p = head,*q = NULL;
    if(memcmp(p->data.name,ch,sizeof(p->data.name))==0)
    {
        head = p->next;
        free(p);
        return head;
    }
    while(p != NULL)
    {
        if(memcmp(p->data.name,ch,sizeof(p->data.name)) == 0)
        {
            q->next = p->next;
            free(p);
            return head;
        }
        q = p;
        p = p->next;
    }
    puts("不存在");
    return head;
}

头删

//头删
Node* list_delhead(Node* head)    
{
    Node* p = head->next;
    free(head);
    head = p;
    return head;
}

尾删

//尾删
void list_deltail(Node* head)    
{
    Node* p = head,*q = NULL;
    while(p->next != NULL)
    {
        q = p;
        p = p->next;
    }
    free(p);
    q->next = NULL;
}

链表长度

//链表长度
int list_long(Node* head)   
{
    Node* p = head;
    int i = 0;
    while(p)
    {
        p = p->next;
        i++;
    }
    return i;
}

链表逆序

/链表逆序
Node* list_reverse(Node* head)     
{
    if(head == NULL)
    {
        return head;
    }
    Node* p = head->next,*q = NULL;
    head->next = NULL;
    while(p != NULL)
    {
        q = p;
        p = p->next;
        q->next = head;
        head = q;
    }
    return head;
}

链表遍历

//链表遍历
void list_print(Node* head)
{
    Node *p = head;
    int num = sizeof(p->data.score)/sizeof(p->data.score[0]);
    if(head == NULL)
    {
        return;
    }
    while(p != NULL)
    {
        printf("%-15s  %-15s  ",p->data.name,p->data.num);
        for(register int i = 0; i < num; i++)
        {
            printf("%-4d  ",p->data.score[i]);
        }
        printf("\n");
        p = p->next;
    }
}

销毁链表

void list_destroy(Node** head)    //销毁链表
{
    Node *p = *head;
    while(p != NULL)
    {
        p = (*head)->next;
        free(*head);
        *head = p;
    }
    head = NULL;
}