#include <vector>#include <string>#include <sstream> // stringstream#include <fstream> // ifstream, ofstream#include <iostream>#include <cstdlib> // systemusing namespace std;struct Entry // The record struct{		string name, address, phone;};vector<Entry> book; // The phone book // This function will create a new entry based on user input and add it to the phone bookvoid createEntry(){	Entry entry;	cout << "Name: ";	getline(cin, entry.name);	cout << "Address: ";	getline(cin, entry.address);	cout << "Phone: ";	getline(cin, entry.phone);	book.push_back(entry);}// Function to find and delete an entry in the bookvoid deleteEntry(){	string name;	cout << "Name to delete: ";	getline(cin, name);	for(vector<Entry>::iterator i = book.begin(); i != book.end(); i++)	{		if(i->name == name)		{			book.erase(i);			break;		}	}}// Function to find and display an entryvoid findEntry(){	string name;	cout << "Name to find: ";	getline(cin, name);	for(vector<Entry>::iterator i = book.begin(); i != book.end(); i++)	{		if(i->name == name)		{			cout << "Name: " << i->name << " Address: " << i->address << " Phone: " << i->phone << endl;			break;		}	}}// Function to list all entries in the phone bookvoid listBook(){	for(vector<Entry>::iterator i = book.begin(); i != book.end(); i++)		cout << i->name << " " << i->address << " " << i->phone << endl;}// Function to load entries from file into the phone bookvoid loadBook(){	string line; // working string	Entry entry; // working entry	ifstream fin("phonebook.txt");	if(fin.is_open()) // if file exists...	{		while(fin.good()) // loop until error or end of file...		{			getline(fin, line); // get next line from file			stringstream ss(line); // fill a stringstream with the line			ss >> entry.name >> entry.address >> entry.phone; // parse the line into the working entry			book.push_back(entry); // store the entry in the book		}	}}// Function to store entries from the phone book into filevoid saveBook(){	ofstream fout("phonebook.txt");	// Iterate through each entry in the book and save it on a single line	for(vector<Entry>::iterator i = book.begin(); i != book.end(); i++)			fout << i->name << " " << i->address << " " << i->phone << endl;	}int main(){		string input; // working string	loadBook(); // Load the phone book at startup...	while(1) // loop forever...	{		system("cls");		cout << "Commands: create, delete, find, list, quit" << endl;		getline(cin, input);		// Execute our functions based on what command the user typed		if(input == "quit")			break; // break out of the loop and quit program		else if(input == "create")			createEntry();			else if(input == "delete")			deleteEntry();			else if(input == "find")			findEntry();			else if(input == "list")			listBook();					else cout << "Unknown command" << endl;		system("pause");	}		saveBook(); // Store the current phone book to file before we exit	return 0;}

...// Function to load entries from file into the phone bookvoid loadBook(){	string line; // working string	Entry entry; // working entry	ifstream fin("phonebook.txt");	if(fin.is_open()) // if file exists...	{		while(!fin.eof()) // loop until end of file...		{			getline(fin, line); // get next line from file			if(line.length() < 2) // dirty fix to skip the last newline				break;			stringstream ss(line); // fill a stringstream with the line			ss >> entry.name >> entry.address >> entry.phone; // parse the line into the working entry			book.push_back(entry); // store the entry in the book		}	}}...

// Function to load entries from file into the phone bookvoid loadBook(){	char cbuf[128];	string line; // working string	Entry entry; // working entry	ifstream fin("phonebook.txt");	if(fin.is_open()) // if file exists...	{		while(!fin.eof()) // loop until error or end of file...		{			getline(fin, line); // get next line from file			if(line.length() < 2) // dirty fix to skip the last newline				break;			stringstream ss(line);	                        // extract three items from the stream separated by :			ss.getline(cbuf, 128, ':');			entry.name = cbuf;			ss.getline(cbuf, 128, ':');			entry.address = cbuf;			ss.getline(cbuf, 128, '\n');			entry.phone = cbuf;						book.push_back(entry); // store the entry in the book		}	}}// Function to store entries from the phone book into filevoid saveBook(){	ofstream fout("phonebook.txt");	// Iterate through each entry in the book	for(vector<Entry>::iterator i = book.begin(); i != book.end(); i++)			fout << i->name << ':' << i->address << ':' << i->phone << endl;	}