第14周任务2

#include<iostream>  
using namespace std;  
  
class Student  
{                            
public:  
    Student(int n,double s){num=n;score=s;next=NULL;}  
    Student *next;  
    int num;  
    double score;  
};  
  
class MyList  
{  
public:  
    MyList(){head=NULL;}  
    MyList(int n,double s){head=new Student(n,s);} //以Student(n,s)作为单结点的链表  
    int display();  //输出链表，返回值为链表中的结点数  
    void insert(int n,double s);  //插入：将Student(n,s)结点插入链表，该结点作为第一个结点  
    void append(int n,double s);  //追加：将Student(n,s)结点插入链表，该结点作为最后一个结点  
    void cat(MyList &il); //将链表il连接到当前对象的后面  
    int length();  //返回链表中的结点数  
private:  
    Student *head;  
};  
  
int MyList::display()  
{  
    if(head==NULL)  
    {  
        cout<<"empty\n";  
        return 0;  
    }  
    int cnt=0;  
    Student *pt=head;  
    while(pt)  
    {  
        ++cnt;  
        cout<<pt->num<<" "<<pt->score<<endl;  
        pt=pt->next;  
    }  
    return cnt;  
}  
  
void MyList::insert(int n, double s)  
{  
    Student * pt=new Student(n,s);  
    pt->next =head;  
    head=pt;  
}  
  
void MyList::append(int n,double s)  
{  
    Student * pt=new Student(n,s);  
    if(head==NULL)  
        head=pt;  
    else   
    {  
        Student *pts=head;  
        Student *pte=pts->next;  
        while(pte)  
        {  
            pts=pte;  
            pte=pts->next;  
        }  
        pts->next=pt;  
    }  
}  
  
void MyList::cat(MyList& il)  
{  
    Student *pt=il.head;  
    while(pt)  
    {  
        append(pt->num,pt->score);  
        pt=pt->next;  
    }  
}  
  
int MyList::length()  
{  
    int cnt=0;  
    Student *pt=head;  
    while(pt)  
    {  
        ++cnt;  
        pt=pt->next ;  
    }  
    return cnt;  
}  
  
int main()  
{  
    int n;  
    double s;  
    MyList head1;  
    cout<<"input head1: "<<endl;  //输入head1链表  
    for(int i=0;i<3;i++)  
    {  
        cin>>n>>s;  
        head1.insert(n,s);  //通过“插入”的方式  
    }  
    cout<<"head1: "<<endl; //输出head1  
    head1.display();  
  
    MyList head2(1001,98.4);  //建立head2链表  
    head2.append(1002,73.5);  //通过“追加”的方式增加结点  
    head2.append(1003,92.8);  
    head2.append(1004,99.7);  
    cout<<"head2: "<<endl;   //输出head2  
    head2.display();  
  
    head2.cat(head1);   //反head1追加到head2后面  
    cout<<"length of head2 after cat: "<<head2.length()<<endl;  
    cout<<"head2 after cat: "<<endl;   //显示追加后的结果  
    head2.display();  
  
    system("pause");  
    return 0;  
}