Task

#include <iostream>
#include "conio.h"
#include <fstream>

using namespace std;

void main_text()
{
    cout<<"1. Pisane na tekst vuv fail"<<endl;
    cout<<"2. Chetene na celiqt fail"<<endl;
    cout<<"3. Tursene na informaciq"<<endl;
    cout<<"4. End"<<endl;
}

int main()
{
    int choice;
    fstream file;

    main_text();
    cin>>choice;

    do
    {

        switch(choice){
        case 1:
            {
                file.open("data.dat", ios::out);

                char new_entry[100];

                cout<<"Vuvedete si teksta: ";
                cin.get();
                cin.getline(new_entry, 100);

                file<<new_entry<<endl;

                file.close();
            }
            break;
        case 2:
            {
                file.open("data.dat", ios::in);
                char old_entry[100];

                while (!file.eof())
                {
                    file>>old_entry;
                    cout<<old_entry<<endl;
                }

                file.close();

                break;
            }
        case 3:
            {
                file.open("data.dat", ios::in);

                char entry[100];
                char search[100];

                cout<<"Koq duma tursite: "; cin>>search;

                while (!file.eof())
                {
                    file>>entry;
                    if(strcmp(search, entry))
                    {
                        cout<<entry<<endl;
                    }

                }

                file.close();
                break;
            }
        }

        main_text();
        cin>>choice;
    }while(choice != 4);

    return 0;
    _getch();
}