#include
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using namespace std;
typedef int data_t;
class LinkList
{
public:
LinkList();
void init(int n);
void show() const;
int getlen() const;
void isempty() const;
int find_by_pos(int pos) const;
int find_by_data(data_t data) const;
int insert_by_pos(int pos, data_t data) const;
void delete_by_pos(int pos) const;
private:
class Node
{
public:
data_t data;
Node *next;
};
Node *head;
int len=0;
};
LinkList ::LinkList()
{
head= new Node;
head->data=0;
head->next=NULL;
}
int LinkList ::getlen() const
{
cout<<"len = "< return len;
}
void LinkList :: show() const
{
Node *p=head->next;
if(!len)
{
cout<<"list is empty";
return ;
}
cout<<"list have element:"< while(p)
{
cout<data<<" ";
p=p->next;
}
cout<}
void LinkList::init(int n) {
Node *pre = head;
len = n;
int i = 1;
while (i<= n) {
cout<< "请输入第"<< i<< "个结点的数据：";
Node *cur = new Node;
cin >>cur->data;
++i;
pre->next = cur;
pre = cur;
cur->next = nullptr;
}
}
void LinkList::isempty()const
{
if(!len)
cout<<"list is empty"< return ;
}
int LinkList::find_by_pos(int pos) const {
if (pos< 0 || pos>= len)
cout<< "pos is error"<< endl;
else {
Node *temp = head->next;
int i = 0;
while (temp) {
if (i == pos) {
cout<< "pos ="<< pos<< "data= "<< temp->data<< endl;
return temp->data;
} else {
++i;
temp = temp->next;
}
}
}
return -1;
}
int LinkList ::find_by_data(data_t data) const
{
Node *p=head->next;
int pos=0;
while(p != NULL && p->data != data){
p = p->next;
pos++;
}
return pos;
}
int LinkList :: insert_by_pos(int pos, data_t data) const
{
if (pos< 0 || pos >= len) {
cout<< "pos is error"<< endl;
} else {
Node *p = head;
while(pos--)
p = p->next;
Node*temp = new Node;
if(temp == NULL)
return -1;
temp->data = data;
temp->next = p->next;
p->next = temp;
cout<< data<< "insert success"<< endl;
return 0;
}
}
void LinkList :: delete_by_pos(int pos) const
{
if (pos< 0 || pos >= len) {
cout<< "pos is error"<< endl;
} else {
Node *p = head;
while(pos != 0){
pos = pos - 1;
p = p->next;
}
Node *q = p->next;
p->next = q->next;
free(q);
cout<< "delete success"<< endl;
}
}
int main(void)
{
LinkList linkList;
cout<< "请输入链表中结点的个数：";
int n;
cin >>n;
linkList.init(n);
linkList.show();
linkList.getlen();
linkList.isempty();
cout<< "请输入需要查询的索引位置：";
int index;
cin >>index;
linkList.find_by_pos(index);
cout<< "请输入需要查询的数据:";
int elem;
cin >>elem;
if (linkList.find_by_data(elem) != -1) {
cout<< elem<< "在链表中的索引位置是"<< linkList.find_by_data(elem)<< endl;
}
cout<< "请输入需要插入结点的位置索引和数值：";
int pos, data;
cin >>pos >>data;
linkList.insert_by_pos(pos, data);
linkList.show();
linkList.getlen();
cout<< "请输入需要删除的结点索引：";
int deleteIndex;
cin >>deleteIndex;
linkList.delete_by_pos(deleteIndex);
linkList.show();
linkList.getlen();
return 0;
}
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