See attached images!Please help very confusedstructsno vectors Write a small application to maintain contact information about people. For each person in your contacts list,you will maintain the following information: name, phone number, and e-mail address. Your list should be ableto handle a maximum of 100 people. In this program, vou will use an array of structs to store the three atributesof each person in the contact list.o See p. 548-549 to see how to use the isdigit library function to make this task easier.Prompt for the first name separately from the last name. Do not make any assumptions about thecontent of the name (for example, either the first or last name might be multiple words).When the user inputs the email, you should validate it. For our purposes, that means the emailmust:o Contain exactly one @o Following the @, it must have at least one character, followed by one dot, followed by atleast one character.Your application should display the following menu:Main MenuDelete Person:A - Add PersonPrompt for and read a last name (only). Search the array for the person, and remove their informationfrom the list. For simplicity, you may assume that all last names are unique. Display an appropriate errormessage if the person is not in the list.Note: the last name comparison should be case insensitive.Note: You should not have “blank" entries in your array between names. When you delete anentry you should “move up" the names after the one you deleted.D - Delete PersonF - Find and Display PersonL - List All PeopleS - Save ListE - ExitFind and Display a PersonPrompt for and read a last name (only). Search the array for the person and display all the informationabout that person, or an error message if the person is not in the list.Note: just as with Delete Person, the last name comparison should be case insensitive.Enter Choice:Your program should continue to display the above menu and perform the indicated action until the "E" optionis selected. You do not need to clear the screen between each operation; simply allow the display to scrollnormally. The user should be able to enter either upper or lower case letters when choosing from the menu.List all PeopleDisplay information about every person in the list. This information should be sorted by last name. Usethe bubble sort algorithm given in your book (you will need to modify the algorithm to work with thisdata). The comparisons in the sort must be case insensitive.Each option is described in more detail below.Save the ListAdd Person:Prompt for and read a name, phone number, and e-mail address from the user. Use this information topopulate the appropriate elements of array. NOTE:You must validate the phone number. For our purposes, a valid phone number is a string thatcontains only digits, dashes, dots, spaces, and parentheses. To keep things simple, you don'thave to verify that the actual content is meaningful, you only have to verify that it doesn’tcontain invalid characters (e.g., we will treat even a phone number like ..-9999) as a valid phonenumber).o Hint: You can access individual characters in a string using standard array notation (eg.,given that phone is a string variable, you can use phone[i] in a loop to access eachcharacter. Use phone.length() to get the length of the string).Write the contents of the array to a file named "contacts.txt" in the current directory. Do not prompt theuser for the name of the file; always use the file contacts.txt. Existing contents in the file (if any) shouldbe replaced by the new data (this will happen automatically when you open the file for writing (useofstream to open the file for writing). Each person's data should be written on a separate line of the file,in the following format:lastname, firstname,phone,e-mailAll values should be comma-separated in the file (no spaces around commas). The comma is not part ofthe data in-memory; commas are in the file only to separate the data values. We are not expecting theuser to ever look at or modify this file directly; all operations on the file are performed by your program.When your programs starts, it should automatically read and populate the array by reading the contacts.txt file.If the file is empty or nonexistent, then the program begins its operation with an empty list (this is notconsidered an error; it just means we have an empty list).When the program ends you should ask if the user wants to save their data.Implementation IssuesYour solution should contain at least one function per Main-Menu option (i.e., a function to add a person, afunction to delete a person, etc.), and you should have additional functions that perform well-defined tasks(e.g., validate the phone number).You may assume that there are no duplicate last names in the list.All updates (add, deletions) are made in-memory only; do not attempt to update the data directly in the file.At the beginning of the program, you will read the entire file into the array of structs. Your program willthen add/delete from the array in memory. When the user tells you to save the data, the entire previouscontents of the file are replaced with the updated list (using ofstream to write to the file will cause thisbehavior).You can use the functions at the end of this document to do case insensitive string comparisons. CASE INSENSITIVE STRING COMPARISONYou can use the following functions to do case insensitive string comparison. Place them in your functions fileand include appropriate prototypes in your header file.#include #include string stringToLower(string s){string result = "";for (int i = 0; i < s.length(); i++)result += tolower(s[i]);return result;}bool isEqual(string s1, string s2)return stringToLower(s1)stringTolower(s2);==}bool isGreater(string s1, string s2){return stringToLower (s1) > stringToLower(s2); }

used to create computer programs. An example program of C++ is : #include <iostream> using…

Write a small application to maintain contact information about people. For each person in your contacts list, you will maintain the following information: name, phone number, and e-mail address. Your list should be abl to handle a maximum of 100 people. In this program, vou will use an array of structs to store the three ttribute of each person in the contact list. Your application should display the following menu: Main Mon1

Write a small application to maintain contact information about people. For each person in your contacts list, you will maintain the following information: name, phone number, and e-mail address. Your list should be abl to handle a maximum of 100 people. In this program, vou will use an array of structs to store the three ttribute of each person in the contact list. Your application should display the following menu: Main Mon1

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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