Modified

#include "City.h"
#include <iostream>
#include <string>
#include <vector>

using namespace std;

//Prints the contents on city_list
void print(vector<City> city_list, size_t init_pos = 0) {
   typedef vector<City>::size_type CityPos;
   for(CityPos count = init_pos; count < city_list.size(); count++) {
      cout << "[" << (count + 1) << "]" ;
      cout << city_list[count].get_name() << " | "
           << "(" << city_list[count].get_location().get_x()
           << ", " << city_list[count].get_location().get_y() << ")\n";
   }
}

//Allows user to enter a City into the list
vector<City> enter_info(vector<City> city_list) {
   string name;
   string input;
   Point location = Point();
   bool okay = false;
   cout << "\nPlease enter the name of the city you're adding:\n";
   cin.ignore(INT_MAX,'\n');
   while(!okay) {
      cin.clear();
      getline(cin, input);
      if(cin.fail()) {
         cerr << "\n\aERROR: Entry not Valid!\n"
              << "Please try again:\n";
      }
      else {
         name = input;
         okay = true;
      }
   }
   cin.clear();

   cout << "\nPlease enter the coordinates of the city "
        << "you're adding in (x,y) format:\n";
   location.Input();
   city_list.push_back(City(location, name));
   return city_list;
}

//Allows the user to find the distance between two chosen cities
void print_distance(vector<City> city_list) {
   int i,j;
   if(city_list.size() != 2) {
      cout << "\nPlease select a city from the list to be your first point:\n";
      print(city_list);
      bool okay = false;
      while(!okay) {
         cin >> i;
         if(i < city_list.size() && i >= 0) {
            okay = true;
         }
         else {
            cerr << "\n\aERROR: Entry not Valid!\n";
         }
      }
      cout << "\nPlease select a city from the list to be your second point:\n";
      okay = false;
      while(!okay) {
         cin >> j;
         if(j <= city_list.size()) {
            okay = true;
         }
         else if(i == j){
            cerr << "\n\aERROR: Choose a city other than "
                 << city_list[i-1].get_name() << ".\n";
         }
         else {
            cerr << "\n\aERROR: Entry not Valid!\n";
         }
      }
   }
   else {
      i = 1;
      j = 2;
   }
   cout << "\nThe distance between " << city_list[i-1].get_name() << " and "
        << city_list[j-1].get_name() << " is:\n"
        << city_list[i-1].distance(city_list[j-1]);
}

int main() {
   vector<City> city_list;
   bool quit = false;
   cout << "\n\n\t\t\tWelcome to City Select";
   while(!quit){
      cout << "\n\nPlease select one of the following options:"
           << "\n1) Enter city Information"
           << "\n2) calculate Distance between two cities"
           << "\n3) Print all cities"
           << "\n4) Quit\n\n";
      char i;
      bool notValid = false;
      do {
         cin >> i;
         if(i == '1' || i == 'E' || i == 'e'){
            city_list = enter_info(city_list);
         }
         else if(i == '2' || i == 'D' || i == 'd'){
            if(city_list.size() >= 2) {
               print_distance(city_list);
            }
            else {
               cerr << "\n\aERROR: Entry not Valid!\n"
                    << "Please have 2+ cities stored before"
                    << "calculating a distance.\n";
            }
         }
         else if(i == '3' || i == 'P' || i == 'p'){
            print(city_list);
         }
         else if(i == '4' || i == 'Q' || i == 'q'){
            quit = true;
         }
         else {
            notValid = true;
         }
      }while(notValid);
   }
   return 0;
}