C++容器作业2 使用链表容器管理系统

#include<iostream>
#include<string>
#include<list>
using namespace std;
class Fox
{
public:Fox(string name, int age, int num) :name(name), age(age), num(num) {}
      void printdata() 
      {
          cout << name<<"\t" << age<<"\t" << num<<"\t" << endl;
      }
      int getage() const
      {
          return age;
      }
      int getnum() const
      {
          return num;
      }
private:
    string name;
    int age;
    int num;
};
class Stsyem
{

public:
      Stsyem() = default;
      void printfmume() 
      {
          cout << "狐狸管理系统" << endl;
          cout << "1.打印狐狸数据" << endl;
          cout << "2.年龄删除狐狸数据" << endl;
          cout << "3.通过年龄排序狐狸" << endl;
          cout << "4.通过编号排序狐狸" << endl;
          cout << "5.插入狐狸的数据" << endl;
          cout << "请做出你的选择" << endl;
}
   
private:
   
};
bool cmpByage(const Fox&object1, const Fox& object2)
{
    if (object1.getage() < object2.getage())
    {
        return true;
    } else 
    {
        return false;
    }
}
bool cmpBynum(const Fox& object1, const Fox& object2)
{
    if (object1.getnum() < object2.getnum())
    {
        return true;
    } else
    {
        return false;
    }
}
using namespace std;
int main() 
{   
    list<Fox> listdata;
    int temp;
    Stsyem mystsyem;
    list<Fox>::iterator itr;
    
    while (1) 
    {
        system("pause");
        system("cls");
        mystsyem.printfmume();
        cin >> temp;
        switch (temp) 
        {
        case 1:
            for (Fox v:listdata)
            {
                v.printdata();
            }
            cout << endl;
            break;
        case 2:
            int temp;
            cout << "请输入要删除狐狸的年龄" << endl;
            cin >> temp;
            for (itr=listdata.begin(); itr!= listdata.end(); ) 
            {
                if ((*itr).getage() == temp)
                {
                    itr = listdata.erase(itr);
                }
                else 
                {
                    itr++;
                }
            }
            if (itr==listdata.begin())
            {
                cout << "未找到需要删除的数据" << endl;
            }
            break;
        case 3:
            listdata.sort(cmpByage);
            break;
        case 4:
            listdata.sort(cmpBynum);
            break;
        case 5:
            string tempname;
            int tempage;
            int tempnum;
            cout << "请输入插入狐狸的姓名,年龄,和编号" << endl;
            cin >> tempname >> tempage >> tempnum;
            listdata.push_back(Fox(tempname, tempage, tempnum));
            break;
        } 
    }    


    return 0;
}