C++實現(xiàn)簡單單向鏈表

更新時間：2020年05月25日 11:40:25 作者：悟名堂

這篇文章主要為大家詳細介紹了C++實現(xiàn)簡單單向鏈表，文中示例代碼介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們可以參考一下

本文實例為大家分享了C++實現(xiàn)簡單單向鏈表的具體代碼，供大家參考，具體內容如下

為了練習一下對鏈表的理解，嘗試手動造輪子，實現(xiàn)單向鏈表的右添加，左添加和刪除的功能。

頭文件

#pragma once
#include<iostream>
using namespace std;
struct Node//節(jié)點
{
 int value;
 Node* next;
 Node(int a = 0, Node* n = NULL) :value(a), next(n) {}
};
class List
{
private:
 Node* head = NULL;//頭指針
 Node* tail = NULL;//尾指針，便于在尾部添加節(jié)點
 int size = 0;
public:
 int getSize() { return size; }//獲取鏈表大小
 void print();//打印鏈表
 void append(int a);//右添加
 void appendleft(int a);//左添加
 void remove(int a);//刪除節(jié)點
};

源文件

#include "List.h"

void List::append(int a)
{
 Node *p = new Node(a);
 if (head)
 {
 tail->next = p;
 tail = p;
 }
 else
 {
 head = p;
 tail = p;
 }
 size++;
}
void List::appendleft(int a)
{
 Node *p = new Node(a);
 if (head)
 {
 p->next = head;
 head = p;
 }
 else
 {
 head = p;
 tail = p;
 }
 size++;
}
void List::remove(int a)
{
 Node* p = head;
 bool flag = false;
 if (!head)
 {
 flag = false;
 cout << "鏈表已空，無需刪除！" << endl;
 }
 else if (head->value == a && head != tail)
 {
 head = head->next;
 delete p;
 size--;
 flag = true;
 cout << "刪除成功！" << endl;
 }
 else if (head->value == a && head == tail)
 {
 head = NULL, tail = NULL;
 delete p;
 size--;
 flag = true;
 cout << "刪除成功！" << endl;
 }
 else
 {
 Node*q = head->next;
 while (q)
 {
  if (q->value == a && q != tail)
  {
  p->next = q->next;
  delete q;
  size--;
  flag = true;
  cout << "刪除成功！" << endl;
  break;
  }
  else if (q->value == a && q == tail)
  {
  p->next = NULL;
  tail = p;
  delete q;
  size--;
  flag = true;
  cout << "刪除成功！" << endl;
  break;
  }
  else
  {
  p = q;
  q = p->next;
  }
 }
 if (!flag)
  cout << "查無此值:" << a << endl;
 }
}
void List::print()
{
 if (!head)
 cout << "鏈表為空，無法輸出！" << endl;
 else
 {
 cout << "鏈表為:" ;
 Node*p = head;
 while (p)
 {
  cout << p->value << " ";
  p = p->next;
 }
 cout << endl;
 }
}

主程序驗證

int main()
{
 List list1;
 list1.append(3);
 list1.append(4);
 list1.appendleft(5);
 list1.appendleft(6);
 list1.append(2);
 cout << "----鏈表大小:" << list1.getSize() << endl;
 list1.print();
 list1.remove(5);
 cout << "----鏈表大小:" << list1.getSize() << endl;
 list1.print();
 list1.remove(7);
 cout << "----鏈表大小:" << list1.getSize() << endl;
 list1.print();
 list1.remove(6);
 cout << "----鏈表大小:" << list1.getSize() << endl;
 list1.print();
 list1.remove(4);
 cout << "----鏈表大小:" << list1.getSize() << endl;
 list1.print();
 list1.remove(3);
 cout << "----鏈表大小:" << list1.getSize() << endl;
 list1.print();
 list1.remove(2);
 cout << "----鏈表大小:" << list1.getSize() << endl;
 list1.print();
 system("pause");
 return 0;
}

驗證結果