小编这次要给大家分享的是C++如何实现单向链表，文章内容丰富，感兴趣的小伙伴可以来了解一下，希望大家阅读完这篇文章之后能够有所收获。
为了练习一下对链表的理解，尝试手动造轮子，实现单向链表的右添加，左添加和删除的功能。
头文件
#pragma once
#include<iostream>
using namespace std;
struct Node//节点
{
int value;
Node* next;
Node(int a = 0, Node* n = NULL) :value(a), next(n) {}
};
class List
{
private:
Node* head = NULL;//头指针
Node* tail = NULL;//尾指针，便于在尾部添加节点
int size = 0;
public:
int getSize() { return size; }//获取链表大小
void print();//打印链表
void append(int a);//右添加
void appendleft(int a);//左添加
void remove(int a);//删除节点
};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 << "链表已空，无需删除！" << endl;
}
else if (head->value == a && head != tail)
{
head = head->next;
delete p;
size--;
flag = true;
cout << "删除成功！" << endl;
}
else if (head->value == a && head == tail)
{
head = NULL, tail = NULL;
delete p;
size--;
flag = true;
cout << "删除成功！" << endl;
}
else
{
Node*q = head->next;
while (q)
{
if (q->value == a && q != tail)
{
p->next = q->next;
delete q;
size--;
flag = true;
cout << "删除成功！" << endl;
break;
}
else if (q->value == a && q == tail)
{
p->next = NULL;
tail = p;
delete q;
size--;
flag = true;
cout << "删除成功！" << endl;
break;
}
else
{
p = q;
q = p->next;
}
}
if (!flag)
cout << "查无此值:" << a << endl;
}
}
void List::print()
{
if (!head)
cout << "链表为空，无法输出！" << endl;
else
{
cout << "链表为:" ;
Node*p = head;
while (p)
{
cout << p->value << " ";
p = p->next;
}
cout << endl;
}
}主程序验证
int main()
{
List list1;
list1.append(3);
list1.append(4);
list1.appendleft(5);
list1.appendleft(6);
list1.append(2);
cout << "----链表大小:" << list1.getSize() << endl;
list1.print();
list1.remove(5);
cout << "----链表大小:" << list1.getSize() << endl;
list1.print();
list1.remove(7);
cout << "----链表大小:" << list1.getSize() << endl;
list1.print();
list1.remove(6);
cout << "----链表大小:" << list1.getSize() << endl;
list1.print();
list1.remove(4);
cout << "----链表大小:" << list1.getSize() << endl;
list1.print();
list1.remove(3);
cout << "----链表大小:" << list1.getSize() << endl;
list1.print();
list1.remove(2);
cout << "----链表大小:" << list1.getSize() << endl;
list1.print();
system("pause");
return 0;
}验证结果
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