Write a program that reads the file created in (1) above. Display the names and numbers on the screen in a suitable format.，display the names and numbers with the names in alphabetical order. usec++

Here's a sample C++ program that reads a file containing names and numbers, displays them on the screen, and sorts them alphabetically by name:

#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>

using namespace std;

struct Contact {
    string name;
    string number;
};

bool compareContacts(const Contact& c1, const Contact& c2) {
    return c1.name < c2.name;
}

int main() {
    ifstream infile("contacts.txt");
    vector<Contact> contacts;

    if (infile) {
        string line;
        while (getline(infile, line)) {
            Contact contact;
            size_t pos = line.find(',');
            if (pos != string::npos) {
                contact.name = line.substr(0, pos);
                contact.number = line.substr(pos + 1);
                contacts.push_back(contact);
            }
        }

        infile.close();

        // Display the names and numbers
        cout << "Contacts:\n";
        for (const auto& contact : contacts) {
            cout << contact.name << ": " << contact.number << "\n";
        }

        // Sort the contacts by name
        sort(contacts.begin(), contacts.end(), compareContacts);

        // Display the sorted names and numbers
        cout << "\nSorted Contacts:\n";
        for (const auto& contact : contacts) {
            cout << contact.name << ": " << contact.number << "\n";
        }
    } else {
        cout << "Unable to open file\n";
    }

    return 0;
}

Assuming the file is named "contacts.txt" and has the following contents:

John Doe,555-1234
Jane Smith,555-5678
Bob Johnson,555-9012

The output of the program would be:

Contacts:
John Doe: 555-1234
Jane Smith: 555-5678
Bob Johnson: 555-9012

Sorted Contacts:
Bob Johnson: 555-9012
Jane Smith: 555-5678
John Doe: 555-1234