CPP链表示例

#include<iostream>
#include<stdlib.h>
using namespace std;
typedef struct Student_data
{
	int data;
	struct Student_data *next;
}*PSD,SD;

PSD creat_list();
int length_list(PSD );
bool sort_list(PSD );
bool insert_list(PSD );
bool traverse_list(PSD );
bool delete_list(PSD );

int main()
{
	PSD pHead = NULL;
	pHead = creat_list();
	int len = length_list(pHead);
	cout<<"链表长度为：\t"<<length_list(pHead)<<endl;
	traverse_list(pHead);
	insert_list(pHead);
	sort_list(pHead);
	traverse_list(pHead);
	delete_list(pHead);
	traverse_list(pHead);
	return 0;
}

PSD creat_list()
{
	int len;
	cout<<"请输入需要输入数据的个数:\t";
	cin>>len;
	PSD pHead = (PSD)malloc(sizeof(SD));
	PSD pTail = pHead;
	pTail->next = NULL;
	if(pHead == NULL)
	{
		cout<<"错误 !";
		exit(-1);
	}
	for(int i=0;i<len;i++)
	{
		PSD pNew = (PSD)malloc(sizeof(SD));
		if(pNew == NULL)
		{
			cout<<"错误 !";
			exit(-1);
		}
		cout<<"请输入第 "<<i+1<<"个数据:\t";
		cin>>pNew->data;
		pTail->next = pNew;
		pNew->next = NULL;
		pTail = pNew;
	}
	return pHead;
}

int length_list(PSD pHead)
{
	int i = 0;
	PSD p=pHead;
	while(p->next!=NULL)
	{
		i++;
		p=p->next;
	}
	return i;
}

bool sort_list(PSD pHead)
{
	cout<<"由小到大排序..."<<endl;
	PSD p=pHead->next,q;
	int t;
	for(p;p!=NULL;p=p->next)
		for(q=p->next;q!=NULL;q=q->next)
			if(p->data>q->data)
			{
				t = p->data;
				p->data = q->data;
				q->data = t;
			}
	traverse_list(pHead);
	return true;
}

bool insert_list(PSD pHead)
{
	int n,x;
	cout<<"请输入在第几个前插入：";
	cin>>n;
	cout<<"插入数据为：";
	cin>>x;
	int i=0;
	PSD p=pHead;
	while(i<n-1)
	{
		p=p->next;
		i++;
	}
	if(p == NULL)
	{
		cout<<"插入失败！"<<endl;
		exit(-1);
	}
	PSD pNew = (PSD)malloc(sizeof(SD));
	if(pNew == NULL)
	{
		cout<<"创建失败！"<<endl;
		exit(-1);
	}
	pNew->data = x;
	PSD t=p->next;
	p->next = pNew;
	pNew->next = t;
	return true;
}

bool traverse_list(PSD pHead)
{
	cout<<"输出："<<endl;
	PSD p=pHead->next;
	while(p!=NULL)
	{
		cout<<p->data<<endl;
		p=p->next;
	}
	return true;
}

bool delete_list(PSD pHead)
{
	cout<<"删除第几个节点：\t";
	int i=0,n;
	cin>>n;
	if(n>length_list(pHead))
	{
		cout<<"删除失败！"<<endl;
		return false;
	}
	PSD p = pHead;
	while(i<n-1)
	{
		p = p->next;
		i++;
	}
	PSD j = p->next;
	if(n==length_list(pHead))
		p->next= NULL;
	else
		p->next = p->next->next;
	delete(j);
	j=NULL;
	return true;
}