用c++实现单向链表的创建，插入和删除

逃离我推掉我的手 2022-08-02 00:26 155阅读 0赞

用c++实现单向链表的创建，插入和删除

#include<iostream>

using namespace std;
    
    typedef struct NODE
    {
     int data;
     struct NODE * next;
    }node;
    
    node * creat();
    void print (node *head);
    int Insert (node * head,int pos,int num);
    int Delete (node * head,int pos);//删除第pos个结点
    
    void main()
    {
        cout<<"线性表啊的链式实现方式 5.16\n";
        node * head;
        head=creat();//以head为表头创建一个链表
        print (head);
        int pos,num;
        cout<<"\ninput the position and number to be insert\n";
        cin>>pos>>num;
        Insert (head,pos,num);
        print (head);
        cout<<"\ninput the position to be delete\n";
    cin>>pos;
    int e=Delete(head,pos);
        print (head); 
    
        cout<<endl;
    }
    
    node * creat()
    {
    node*head=NULL;
    node*end=NULL;
    node*ps;
    int num;
    ps=new node;
    ps->next=NULL;
    head=ps;
    end=ps;
    cout<<"input numbers end with 0:";
    cin>>num;
     while(num!=0)
     {
    ps=new node;
    ps->data=num;
    end->next=ps;
    end=ps;
    cin>>num;
      }
    end->next=NULL;
    return head;
    }
    
    void print (node * head)
    {
      node * travel  =head->next;
      while(travel!=NULL)
      {
      cout<<travel->data<<' ';
      travel=travel->next;
      }
    }
    
    int Insert (node * head,int pos,int num)
    {
       node * p=head;
       int j=0;
       while(p&&j<pos-1)//若p!=null,循环pos-1次到pos-1个结点，再将创建的新结点插入到第pos个位置。
       {
           p=p->next;
           ++j;
       }
       if(!p||j>pos-1)
           return 0;
       node * s=(node *)malloc(sizeof(node));//生成新结点
       s->data=num;
       s->next=p->next;
       p->next=s;
       return 0;    
    
    }
    int Delete (node * head,int pos) //删除第pos个结点
    {
        node * p= head;
        int j=0;
        while(p->next&&j<pos-1)
        {
    
            p=p->next;
            j++;
        }
        if(!(p->next)||j>pos-1)
            return 0;
        node * q=p->next;
        p->next=q->next;
        int e=q->data;
        free(q);
        return e;
    }