อยากให้ชข่วยดูให้หน่อยค่ะว่าผิดตรงไหน รันได้ไม่หมดค่ะ แต่ไม่ขึ้น error น่ะคะ


#include<iostream>
#define maxcity 50
using namespace std;

//Lin6klist
    
    //structure of a city in list
    struct City
    {
        string cityName; //name of city
        int x; // X coordinate of city
        int y; // Y coordinate of city
    };
    
    //structure of city node in list
    struct CityNode
    {
        
        CityNode *nextCity;
        City *cityinfo;
    };
    
    //class definition of city database
    class CityDB
    {
        private:
            CityNode *headCity; //pointer for head city
            
        public:
        
            CityDB()
            {
            headCity = NULL;
            }

            void insertCity(City* city)
            {
                cout<<"casjdaisld";
                //if list empty
                if(headCity == NULL)
                {    cout<<"checka";
                    headCity->cityinfo = city;
                    cout<<"checka";
                }
                else
                {
                    headCity->nextCity = headCity;
                    headCity->cityinfo = city;
                    cout<<"checkb";
                }    
            }

            void delCityByName(string cityName)
            {
                if(headCity == NULL)
                {
                    cout << "Underflow"    <<endl;
                }
                CityNode *currCity, *prevCity;
                currCity = headCity;
                prevCity = NULL;
                while (currCity != NULL)
                {
                    if(cityName.compare(currCity->cityinfo->cityName) == 0)
                    {
                        break;
                    }
                    prevCity = currCity;
                    currCity = currCity->nextCity;
                }
                //city to be deleted not found
                if(currCity == NULL)
                {
                    cout << "Does not exist." <<endl;
                }
                else
                {
                    prevCity->nextCity = currCity->nextCity;
                    delete currCity;
                }
            }

            void delCityByCoor(int x , int y)
            {
                if(headCity == NULL)
                {
                    cout << "Underflow" << endl;
                }
                CityNode *currCity, *prevCity;
                currCity = headCity;
                prevCity = NULL;
                while(currCity != NULL)
                {
                    if(currCity->cityinfo->x == x && currCity->cityinfo->y == y)
                    {
                        break;
                    }
                    prevCity = currCity;
                    currCity = currCity->nextCity;
                }
            
                //city to be deleted not found
                if(currCity == NULL)
                {
                    cout << "Does not exist."<<endl;
                }
                else
                {
                    prevCity->nextCity = currCity->nextCity;
                    delete currCity;
                }
            }

            void searchCityByName(string cityName)
            {
                if(headCity == NULL)
                {
                    cerr << "Empty! Nothing to search!" <<endl;
                }
                CityNode *currCity;
                currCity = headCity;
                while (currCity != NULL)
                {
                    if(cityName.compare(currCity->cityinfo->cityName)==0)
                    {
                        cout <<"City found:"<<cityName <<endl;
                    }
                    currCity = currCity->nextCity;
                }
                
                //city to be deleted not found
                if(currCity == NULL)
                {
                    cout <<"City not found: "<<cityName<<endl;
                }
            }

            void searchCityByCoor(int x, int y)
            {
                if(headCity == NULL)
                {
                    cerr << "Empty! Nothing to search!" <<endl;
                }
                CityNode *currCity;
                currCity = headCity;
                while (currCity != NULL)
                {
                    if(currCity->cityinfo->x == x && currCity->cityinfo->y == y)
                    {
                        cout <<"City found:"<<endl;
                    }
                    currCity = currCity -> nextCity;
                }
                
                //city to be deleted not found
                if(currCity == NULL)
                {
                    cout <<"City not found: "<<endl;
                }
            }

            bool run()
                {
                int x, y, n , choice;
                 string cityName;
                bool start = true;
                 cout<<"->>";
                 cin>>choice;
                 if(choice < 0 || choice >7)
                {
                cout<<"Invalid input, please enter again"<<endl;
                cout<<"->>";
                 cin>>choice;
                }     
                switch(choice)
                 {
                     
                     
            case 1:
                 cout<<"How many cities do you want to store: ";
                 cin>>n;
                 
                 for(int i = 0; i < n; i++)
                 {
                    City* city = new City[n];
                    cout<<"Enter city " <<i+1<< " name :";
                    cin>>cityName;
                    cout<<"Enter coordinate X and Y in order: ";
                    cin>>x>>y;
                    cout<<endl;
                    city.cityName = cityName;
                    city.x = x;
                    city.y = y;
                    insertCity(city);
                }
                break;
                
                case 2:
                    
                cout<<"Enter name of the city you want to delete: ";
                cin>>cityName;
                delCityByName(cityName);
                break;
                
                case 3:
                    
                cout<<"Enter coordinate of the city you want to delete: ";
                cin>>x>>y;
                delCityByCoor(x,y);
                break;
                    
                case 4:
                
                cout<<"Enter name of the city you want to search: ";
                cin>>cityName;
                searchCityByName(cityName);
                break;
            
                case 5:
                cout<<"Enter coordinate of the city you want to search: ";
                cin>>x>>y;
                searchCityByCoor(x,y);
                break;
                
                case 6:
                    start = false;
                    break;
                }
                return start;
                }
};


int main(){
    CityDB citydb;
    int n,x,y;
    string cityName;
    cout<<"--Press 1 to insert"<<endl;
    cout<<"--Press 2 to delete by name"<<endl;
    cout<<"--Press 3 to delete by coordinate"<<endl;
    cout<<"--Press 4 to search by name"<<endl;
    cout<<"--Press 5 to search by coordinate"<<endl;
    cout<<"--Press 6 to end program"<<endl;
    cout<<"________________________________________________"<<endl;
    
    while(citydb.run());
    return 0;
}