## 数据结构——单链表的数据插入删除查询##

二话不说，上代码

/** * 命名空间: std * 功 能： 单链表的基本算法和链表的建立 * 类 名： * * Ver 变更日期2017.5.8 负责人 wall * ─────────────────────────────────── * V0.01 2017.5.8 Wall 初版 * * Copyright (c) 2017 Lir Corporation. All rights reserved. * *备注：本程序所有数据类型DataType均为int型 */


#include <iostream>
using namespace std;
struct Node
{
    int data;
    Node*next;
};
class Linklist
{
public:
    Linklist()
    {
        first = new Node;
        first->next = NULL;
    }
    Linklist(int a[], int n)//尾插法 
    {
        first = new Node;
        first->next = NULL;
        for (int i = 0; i<n; i++)
        {
            Node*p; p = new Node; p->data = a[i];
            p->next = first->next;
            first->next = p;
        }
    }
    void Printlist();
    int Get(int i); int Locate(int x); int length();
    void Insert(int i, int x);
    int Delete(int i);

private:
    Node*first;
};
int Linklist::Locate(int x)//值查 
{
    Node*p; p = new Node;
    p = first->next;
    int count = 1;
    while (p != NULL)
    {
        if (p->data == x)return count;
        p = p->next;
        count++;
    }
    return 0;
}
void Linklist::Insert(int i, int x)//插入 
{
    Node*p; p = new Node; p = first;
    int count = 0;
    while (p != NULL&&count<i - 1)
    {
        p = p->next;
        count++;
    }
    if (p == NULL)throw"输入错误";
    else
    {
        Node*q; q = new Node; q->data = x;
        q->next = p->next;
        p->next = q;
    }
}

int Linklist::Delete(int i)//删除 
{
    Node*p; p = new Node; int x;
    p = first; int count = 0;
    while (p != NULL&&count<i)
    {
        p = p->next;
        count++;
    }
    if (p == NULL || p->next == NULL) throw"输入错误";
    else
    {
        Node*q; q = new Node;
        q = p->next; x = q->data;
        p->next = q->next;
        delete q;
        return x;
    }
}
void Linklist::Printlist()//遍历 
    {
        cout << "链表为";
        Node*p; p = new Node;
        p = first->next;
        while (p != NULL)
        {
            cout << p->data << ',';
            p = p->next;
        }
        cout << endl;
    }
    int Linklist::length()//长度 
    {
        Node*p; p = new Node; int count = 0;
        p = first->next;
        while (p != NULL)
        {
            p = p->next;
            count++;
        }
        return count;
    }
    int main()
    {

        int n = 0;
        int i, x,h;
        int a[100];
        cout << "Please enter the length of the array:"; cin >>h;
        for (int i = 0; i<h; i++)
        {
            cin >> x; a[i] = x;
        }
        Linklist c(a, h);
        c.Printlist();
        while (1)
        {
            int m;
            cout << "-------------操作选项-----------" << endl;
            cout << "1:在指定位置插入" << endl;
            cout << "2:在指定位置删除" << endl;
            cout << "3:在指定位置查找" << endl;
            cout << "0：结束程序" << endl;
            cout << "---------------------------------" << endl;

            cin >> m;
            if (m == 1)
            {
                cin >> i >> x;
                if (i<0 || i>c.length())
                    cout << "输入错误" << endl;
                else {
                    c.Insert(i + 1, x);
                    c.Printlist();
                }
                continue;
            }
            else if (m == 2)
            {
                cin >> i;
                if (i<0 || i>c.length())
                    cout << "输入错误" << endl;
                else {
                    cout << c.Delete(i - 1) << endl;
                    c.Printlist();
                }
                continue;
            }
            else if (m == 3)
            {
                cin >> x;
                if (c.Locate(x)>0)
                    cout << c.Locate(x) - 1 << endl;
                else cout << "输入错误" << endl;
                continue;
            }
            else if (m == 0)
            {
                return 0;
            }
        }

    }

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