Zip Code/City Sequential Access File Program Help

arooj (39)
Im writing a program that stores zip codes with corresponding cities in a sequential access file. This I have no problem with. The program also has to display the city corresponding with the zip code entered by the user, and vice versa. I am confused on what to do for this part of the program. 

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//Ch13Ex1.cpp – saves cities and ZIP codes to a sequential access file
//and also displays the city corresponding to a ZIP code

#include <iostream>
#include <string>
#include <fstream>

using std::cout;
using std::cin;
using std::endl;
using std::string;
using std::ifstream;
using std::ofstream;
using std::ios;

//function prototypes
int displayMenu();
void addRecords();
void displayCity();
void displayZip();

int main()
{	
	//declare variable
	int menuChoice = 0;

	//display menu and get choice
	menuChoice = displayMenu();

	//call appropriate function
	//or display error message
	while (menuChoice != 4)
	{
		if (menuChoice == 1)
			addZipcity();
		else if (menuChoice == 2)
			displayCity();
		else if (menuChoice == 3)
			displayZip();
		else
			cout << "Invalid menu choice" << endl;
		//end ifs

		//display menu and get choice
		menuChoice = displayMenu();
	}	//end while
	return 0;
}   //end of main function

//*****function definitions*****
int displayMenu()
{
	//declare variable
	int choice = 0;

	//display menu
	cout << "Options" << endl;
	cout << "1 Add Zip/City" << endl;
	cout << "2 Display City" << endl;
	cout << "3 Display Zip Code" << endl;
	cout << "4 Exit Program" << endl;

	//get user's choice, then return the choice
	cout << "Enter menu option: ";
	cin >> choice;
	cin.ignore(1);
	return choice;
}	//end of displayMenu function

void addRecords()
{
	string zip = "";
	string city = "";

	ofstream outFile;
	outFile.open("zipcity.txt", ios::app);

	if (outFile.is_open())
	{	//get the name
		cout << "Enter zip code (X to stop): ";
		getline(cin, zip);
		while (zip != "X" && zip != "x")
		{
			//get the city 
			cout << "Enter city: ";
			getline(cin, city);
			cin.ignore();
			//write the record
			outFile << zip << '#' << city << endl;
			//get another name
			cout << "Enter zip (X to stop): ";
			getline(cin, zip);
		} //end while

		//close the file
		outFile.close();
	} //end if
	else
		cout << "File could not be opened." << endl;
	//end if
} //end of addZipcity function

void displayCity()
{
//declare variables
	string input = "";
	string zip = "";
	string city = "";
	bool found = false;

	//create file object and open the file
	ifstream inFile;
	inFile.open("zipcity.txt", ios::in);

	//determine whether the file was opened
	if (inFile.is_open())
	{
		//read a record
		cout << "Enter zip code: ";
		cin >> zip;
		while (!inFile.eof() && !found) 
		{
			
			cout << "City: " << city << endl;
			
			

			//read another line from the file
				getline(inFile, input);

		} //end while

		//close the file
		inFile.close();

	}
	else 
		cout << "File could not be opened." << endl;
	//end if 
}

void displayZip()
{

}


for void displayZip() I know I'd essentially have to reverse whatever I did in void displayCity().

I am extremely confused.
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