Program 12 BCA Madras University BCA Object Oriented Programming using C++ Practical Madras University Program 12 Implement a telephone directory using files

 

BCA

Object Oriented Programming using C++ Practical

Madras University 

Program 12

 Implement a telephone directory using files

SOURCE CODE:

#include <iostream>

#include <fstream>

#include <string>

#include <vector>

using namespace std;

struct Contact {

    string name;

    string phoneNumber;

};

void addContact(const Contact& contact) {

    ofstream outFile("directory.txt", ios::app); // Open file in append mode

    if (outFile.is_open()) {

        outFile << contact.name << "," << contact.phoneNumber << endl;

        outFile.close();

    } else {

        cout << "Unable to open file." << endl;

    }

}

vector<Contact> loadContacts() {

    vector<Contact> contacts;

    ifstream inFile("directory.txt");

    if (inFile.is_open()) {

        string line;

        while (getline(inFile, line)) {

            size_t pos = line.find(',');

            if (pos != string::npos) {

                Contact contact;

                contact.name = line.substr(0, pos);

                contact.phoneNumber = line.substr(pos + 1);

                contacts.push_back(contact);

            }

        }

        inFile.close();

    } else {

        cout << "Unable to open file." << endl;

    }

    return contacts;

}

void searchContact(const string& name) {

    vector<Contact> contacts = loadContacts();

    bool found = false;

    for (const auto& contact : contacts) {

        if (contact.name == name) {

            cout << "Name: " << contact.name << ", Phone Number: " << contact.phoneNumber << endl;

            found = true;

            break;

        }

    }

    if (!found) {

        cout << "Contact not found." << endl;

    }

}

int main() {

    int choice;

    while (true) {

        cout << "1. Add Contact" << endl;

        cout << "2. Search Contact" << endl;

        cout << "3. Exit" << endl;

        cout << "Enter your choice: ";

        cin >> choice;

        cin.ignore(); // Ignore newline character left in the buffer

        if (choice == 1) {

            Contact contact;

            cout << "Enter name: ";

            getline(cin, contact.name);

            cout << "Enter phone number: ";

            getline(cin, contact.phoneNumber);

            addContact(contact);

        } else if (choice == 2) {

            string name;

            cout << "Enter name to search: ";

            getline(cin, name);

            searchContact(name);

        } else if (choice == 3) {

            break;

        } else {

            cout << "Invalid choice, please try again." << endl;

        }

    }

    return 0;

}

OUTPUT:

1. Add Contact

2. Search Contact

3. Exit

Enter your choice: 1

Enter name: ram

Enter phone number: 9488399999

1. Add Contact     

2. Search Contact  

3. Exit

Enter your choice: 1

Enter name: raj

Enter phone number: 9129320101

1. Add Contact     

2. Search Contact  

3. Exit

Enter your choice: 1

Enter name: gowri

Enter phone number: 9222122931

1. Add Contact

2. Search Contact

3. Exit

Enter your choice: 2

Enter name to search: ram

Name: ram, Phone Number: 9488399999

1. Add Contact

2. Search Contact

3. Exit

Enter your choice: 2

Enter name to search: ravi

Contact not found.

1. Add Contact

2. Search Contact

3. Exit

Enter your choice: 3

Explanation:

1. Contact Structure: Holds the contact's name and phone number.
2. File Operations:
   • addContact appends new contacts to the file.
   • loadContacts reads all contacts from the file into a vector.
   • searchContact searches for a contact by name and prints the result.
3. Main Function: Provides a simple menu-driven interface for adding and searching contacts.