单链表的基本操作

按C语言代码编写

• 节点

typedef struct Student {
    char name[20];       //学生姓名
    int num;             //学号
    struct Student *next;
}node;       //node为struct Student的别名

• 链表的创建

node *creat() {
    node *head = NULL, *tail = NULL;
    node *pNode = malloc(sizeof(node));
    scanf("%s%d", pNode->name, &pNode->num);
    while(pNode->num) {      //这里以学号为零结束创建
        if(!head) head = tail = pNode;
        tail->next = pNode;
        tail = pNode;
        pNode = malloc(sizeof(node));
        scanf("%s%d", pNode->name, &pNode->num);
    }
    if(head) tail->next = NULL;//注意，条件不可以省
    return head;
}

• 输出

void output(node *head) {
    if(!head) printf("This list is empty!\n");
    node *pNode;
    for(pNode = head; pNode; pNode = pNode->next)
        printf("%s\t%d\n", pNode->name, pNode->num);
}

• 查找

//通过姓名查找某位同学的具体信息
node *find(node *head, const char *name) {
    node *pNode = NULL;
    for(pNode = head; pNode; pNode = pNode->next)
        if(!strcmp(pNode->name, name))
            return pNode;   
    return pNode;
}

• 修改

//修改某位学生信息
void revise(node *head, const char *name) {
    node *pNode = find(head, name);
    if(!pNode)
        printf("No such person!\n");
    else
        scanf("%s%d", pNode->name, &pNode->num);
}

• 删除

//按姓名删除
void Delete(node *head, const char *name) {
    if(!head || !head->next) return ;
    node *pNode = head;
    while (pNode->next) {
        if (!strcmp(pNode->next->name, name)) {
            node *dNode = pNode->next;
            pNode->next = dNode->next;
            free(dNode);
            break;
        }
        if(pNode->next)
            pNode = pNode->next;
    }
}

• 排序

//选择排序(按num从小到大排）
void mySort(node *head) {
    if(!head || !head->next) return ;
    node *pi, *pj, *tnode;
    node tNode;
    for (pi = head; pi->next; pi = pi->next) {
        for (pj = pi->next; pj; pj = pj->next) {
            if (pi->num > pj->num) {
                tNode = *pi;
                *pi = *pj;
                *pj = tNode;
                tnode = pi->next;
                pi->next = pj->next;
                pj->next = tnode;
            }       
        }
    }
}

• 测试代码

void main() {
    node *head = NULL;
//创建函数和输出
    head = creat();
    output(head);
// 查找
    char name[20];
    scanf("%s", name);
    node *pNode = find(head, name);
    if(pNode)
        printf("%s\t%d\n", pNode->name, pNode->num);
    else
       printf("No such person!\n");
//修改
    scanf("%s", name);
    revise(head, name);
    output(head);
//删除
    scanf("%s", name);
    Delete(head, name);
    output(head);
//排序
    mySort(head);
    output(head);
    return 0;   
}

C++代码

#include <iostream>
#include <string>
using namespace std;
struct node {
    string name;
    int num;
    node *next;
};
//单链表的创建
node *creat() {
    node *head;
    node *pNode = new node;
    head = pNode;
    return head;
}
//头插法
void push_front(node *head, string str, int val) {
    if(!head) return ;
    node *pNode = new node;
    pNode->name = str;
    pNode -> num = val;
    pNode->next = head->next;
    head->next = pNode;
}
//尾插法
void push_back(node *head,string str, int val) {
    if(!head) return ;
    node *tail;
    for (tail = head; tail->next; tail = tail->next);
    node *pNode = new node;
    pNode->name = str;
    pNode->num = val;
    tail->next = pNode;
    pNode->next = nullptr;
}
//删除（此处按姓名删除）
void remove(node *head, string str) {
    if(!head || !head->next) return ;
    node *pNode = head;
    while (pNode->next) {
        if (pNode->next->name == str) {
            node *flag = pNode->next;
            pNode->next = pNode->next->next;
            delete flag;
        }
        if(pNode->next)
            pNode = pNode->next;
    }
}
//计算链表的节点
int n_node(node *head) {
    int count = 0;
    for (node *pNode = head; pNode; pNode = pNode->next)
        ++count;
    return count;
}
//选择排序(按num从小到大排）
void mySort(node *head) {
    if(!head || !head->next) return ;
    for (node *pi = head; pi->next; pi = pi->next) {
        for (node *pj = pi->next; pj; pj = pj->next) {
            if (pi->num > pj->num) {
                node tNode = *pi;
                *pi = *pj;
                *pj = tNode;
                node *tnode = pi->next;
                pi->next = pj->next;
                pj->next = tnode;
            }       
        }
    }
}
//在有序的链表中插入
void push(node *head, string str, int val) {
    if(!head) return ;
    push_front(head, str, val);
    mySort(head);
}
//链表的输出
void output(node *head) {
    for (node *pNode = head; pNode; pNode = pNode->next)
        cout << pNode->name << ' ' << pNode->num << endl;
}
int main() {
    node *head = nullptr;
    head = creat();
    cin >> head->name;
    cin >> head->num;
    head->next = nullptr;
    string str;
    int val;
    for (int i = 0; i < 3; ++i) {
        cin >> str;
        cin >> val;
        push_front(head, str, val);
    }
    cout << "push_front:" << endl;
    output(head);
    for (int i = 0; i < 3; ++i) {
        cin >> str;
        cin >> val;
        push_back(head, str, val);
    }
    cout << "push_back:" << endl;
    output(head);
    cin >> str;
    remove(head, str);
    cout << "remove:" << endl;
    output(head);
    mySort(head);
    cout << "sort:" << endl;
    output(head);
    for (int i = 0; i < 3; ++i) {
        cin >> str;
        cin >> val;
        push(head, str, val);
    }
    cout << "push:" << endl;
    output(head);
    cout << "节点：" << n_node(head) << endl;
    return 0;
}

第一次写博客，有什么不好的地方，欢迎拍砖。