// All three programs are written here

// A menu driven program which allows to use all programs at the same time

// Done be Rustam Zokirov (U1910049)

// Last change done in April 13, 2020

#include <iostream>

#include <string>

#include <conio.h> // for getch()

#include <fstream> // library which allows to work with files

#include <iomanip> // for using function setw()

using namespace std;

int main();

void F_First_Program()

{

// creating a text file one.txt

ofstream out_one;

out_one.open("one.txt");

for (int i = 2; i <= 2 * 10; i = i + 2)

{

out_one << i << endl; // writing to file first ten even numbers

}

out_one.close(); // closing the file

// creating a text file one.txt

ofstream out_two;

out_two.open("two.txt");

for (int i = 5; i <= 5 * 10; i = i + 5)

{

out_two << i << endl; // writing to file first ten multiples of five

}

out_two.close(); // closing the file

// calculting the sum

ifstream in_one;

ifstream in_two;

in_one.open("one.txt"); // opening files

in_two.open("two.txt");

int total = 0;

int num1 = 0;

int num2 = 0;

while (in_one && in_two)

{

total += num1 + num2; // calculating the total

in_one >> num1;

in_two >> num2;

}

in_one.close(); // closing the files

in_two.close();

///////////////////////////////////////////////////////////////////

// creating a file total for storingthe total sum of numbers

ofstream out_total("total.txt");

out_total << total << endl;

out_total.close();

// reading the file and outputing it on the screen

ifstream in_total;

in_total.open("total.txt");

cout << "All three Files are created!\n";

in_total >> total;

cout << "TOTAL: " << total << "\n\n"; // displaying the total in console

in_total.close(); // closing the file after executing

}

void F_Second_Program()

{

for (int k = 0; k < 1000; k++)

{

system("cls");

cout << "C O N T A C T S\n"

<< "------------------\n"

<< "1. Add a contact\n"

<< "2. Contacts\n"

<< "0. Back\n"

<< "Your choice: \n";

ofstream out_contacts("contacts.txt", ios::app);

string name, phone;

switch (_getch())

{

// case 49 is for adding a new contact into a list

case 49:

{

system("cls");

cout << "Adding a new contact. Input a contact info:\n\n";

cout << "Enter the name: ";

cin >> name;

cout << "Enter the phone number: ";

cin >> phone;

// storing the data in file

out_contacts << left << setw(12) << name << "\t" << phone << "\n";

out_contacts.close(); // closing the file

cout << "Successfully added!\n\n";

system("pause");

}

break;

case 50:

{

system("cls");

ifstream in_contacts("contacts.txt"); // getting data from the file

while (in_contacts >> name >> phone)

{

// displaying the data

cout << left << setw(12) << name << "\t" << phone << endl;

}

in_contacts.close(); // closing the file

system("pause");

}

break;

case 48:

{

main(); // to back to main menu

}

break;

default:

{

cout << "Your choice is not available in Menu.\nPlease try one more time\n";

system("pause");

}

break;

} // switch

} // for loop

}

void F_Third_Program()

{

for (int k = 0; k < 1000; k++)

{

system("cls");

cout << "S E A R C H I N G F O R N U M B E R \n"

<< "------------------------------------\n"

<< "1. Add numbers\n"

<< "2. Search for number\n"

<< "0. Back\n"

<< "Your choice: \n";

ofstream out_numbers("numbers.txt", ios::app); // the list could be contiunied after the program execution

int numbers;

switch (_getch())

{

case 49:

{

system("cls");

cout << "ENYER NUMBERS\n";

// inputing numbers

for (int i = 1; i <= 20; i++)

{

cout << "[ " << i << " ] -> ";

cin >> numbers;

out_numbers << numbers << endl;

}

out_numbers.close(); // closing the file

system("pause");

}

break;

case 50:

{

system("cls");

ifstream in_numbers("numbers.txt");

cout << "SEARCHING A NUMBER\n";

int search_number;

bool isAnswerHere = 0; // for finding the searching number from available list

cout << "Enter the number to search: ";

cin >> search_number;

while (in_numbers)

{

in_numbers >> numbers;

if (search_number == numbers)

isAnswerHere = 1;

} // while loop

if (isAnswerHere == 1)

cout << "\nThe number is available in list.\n\n";

else

cout << "\nThe number is NOT in list\n\n";

system("pause");

}

break;

case 48:

{

main();

}

break;

default:

{

cout << "Your choice is not available in Menu.\nPlease try one more time\n";

system("pause");

}

break;

} // switch

} // for loop

}

int main()

{

for (int k = 0; k < 1000; k++)

{

system("cls");

cout << "M A I N M E N U\n"

<< "-------------------\n"

<< "1. First Program\n"

<< "2. Second Program\n"

<< "3. Third Program\n"

<< "Your choice: \n";

switch (_getch())

{

case 49:

system("cls");

F_First_Program();

system("pause");

break;

case 50:

system("cls");

F_Second_Program();

system("pause");

break;

case 51:

system("cls");

F_Third_Program();

system("pause");

break;

case 48:

return 0;

break;

default:

cout << "Your choice is not available in Menu.\nPlease try one more time\n";

system("pause");

break;

} // switch

} // for loop

system("pause");

return 0;

}