Поиск по диапазону значений (ооп)

#include <iostream>
#include <fstream>
#include <string>
#include <cstdlib>
#include <sstream>
#include <vector>
using namespace std;
 
class RealtorOffice
{
public:
    string Location;
    string LocOfDeclarant;
    int NumberOfRooms;
    int Price;
 
 
 
    //void search_by_price();
    //void search_by_number();
};
    void print(RealtorOffice &obj)
    {
        cout << "Location: "<<obj.Location<<"\nLocation of declarant: "<<obj.LocOfDeclarant<<"\nNumber of rooms: "<<obj.NumberOfRooms<<"\nPrice: "<<obj.Price<<"\n\n"<<endl;
    }
void input();
void output();
 
int menu()
{
    cout << " ::: HIIIIIIIIII ::: " <<endl<< endl;
    cout << "****************************************************" << endl << endl;
 
    cout << ":::Menu:::\n\n";
    int choice;
    cout<<"0. Exit"<<endl
    <<"1. All apartments"<<endl
    <<"2. Search by price"<<endl
    <<"3. Search by number of rooms"<<endl
    <<"Your choice->";
    cin>>choice;
    return choice;
}
 
void input()
{
    ofstream file_obj;
    file_obj.open("Input.txt", ios::app);
 
    RealtorOffice obj;
 
    obj.Location = "New_York";
    obj.LocOfDeclarant = "LA";
    obj.NumberOfRooms = 1;
    obj.Price = 150;
 
    file_obj << obj.Location << " ";
    file_obj << obj.LocOfDeclarant << " ";
    file_obj << obj.NumberOfRooms << " ";
    file_obj << obj.Price << endl;
 
    obj.Location = "Chicago";
    obj.LocOfDeclarant = "Chicago";
    obj.NumberOfRooms = 2;
    obj.Price = 250;
 
    file_obj << obj.Location << " ";
    file_obj << obj.LocOfDeclarant << " ";
    file_obj << obj.NumberOfRooms << " ";
    file_obj << obj.Price << endl;
}
 
void output(vector<RealtorOffice> &v)
{
    ifstream file_obj;
    file_obj.open("Input.txt");
 
    RealtorOffice obj;
    for(string s; getline(file_obj,s);)
    {
        stringstream stream(s);
        stream >> obj.Location;
        stream >> obj.LocOfDeclarant;
        stream >> obj.NumberOfRooms;
        stream >> obj.Price;
        v.push_back(obj);
        print(obj);
    }
}
 
int main()
{
    input();
 
    vector<RealtorOffice> v;
    vector<RealtorOffice> res;
 
 
    int counter=4;
    int choice;
    do
    {
        choice = menu();
        switch(choice)
        {
            case 0: cout<<"bye"<<endl;
            break;
            case 1:output(v);
            break;
           /* case 2:search_by_price();
            break;*/
            /*case 3:object.search_by_number();
            break;*/
        }
    }
    while(choice!=0);
    return 0;
}

class RealtorOffice
{
public:                               //Эти данные должны быть в private:
    string Location;
    string LocOfDeclarant;
    int NumberOfRooms;
    int Price;
 
 
 
    //void search_by_price(); //Методы, функции члены класса в public:
    //void search_by_number();
};

int menu()
{
    cout << " ::: HIIIIIIIIII ::: " <<endl<< endl;
    cout << "****************************************************" << endl << endl;
 
    cout << ":::Menu:::\n\n";
    int choice;
    cout<<"0. Exit"<<endl
    <<"1. All apartments"<<endl
    <<"2. Search by price"<<endl
    <<"3. Search by number of rooms"<<endl
    <<"Your choice->";
    cin>>choice;
    return choice;
}