Phone book 1

#include <iostream>
#include<string>
#include<iomanip>
#include<fstream>
#include<stdio.h>
#include<cstdlib>
//#include<string.h>


using namespace std;
const string na("NOT ASSIGNED");
class Name
{
    private:
        void replace_null_name();
    public:
        string first_name;
        string middle_name;
        string last_name;
    public:
        Name()
        {
            first_name.assign("") ;
            middle_name.assign(na);
            last_name.assign(na);
        }
        void take_name();
};
void Name::take_name()
{
    cin.ignore();
    cout<<"\nEnter the First Name (mandatory field)\n";
    getline(cin,first_name);
    cout<<"\nEnter the Middle Name\n";
    getline(cin,middle_name);
    cout<<"\nEnter the Last Name\n";
    getline(cin,last_name);
    replace_null_name();
}
void Name::replace_null_name()
{
    if(first_name.empty())
        {
            first_name.assign("");
            cout<<"pls enter a valid name \n";
            take_name();
        }
    if(middle_name.empty())
        middle_name.assign("");
    if(last_name.empty())
        last_name.assign("");
}
class Phone_No
{
    private:
        void validate_mobile();
        void validate_landline();
    public:
        string landline,mobile;
    public:
        Phone_No()
        {
            landline.assign(na);
            mobile.assign(na);
        }
        void take_mobile_no();
        void take_landline();
};
void Phone_No::take_mobile_no()
{
    cout<<"\n Enter the mobile number (mandatory field) \n";
    getline(cin,mobile);
    validate_mobile();
}
void Phone_No::take_landline()
{
    cout<<"\n Enter the Land line number (with code)\n";
    getline(cin,landline);
    validate_landline();
}
void Phone_No::validate_mobile()
{
    if(!mobile.empty())
    {
        if((mobile.length())!=10)
        {
            cout<<"invalid input";
            mobile.assign(na);
        }
    }
    if(mobile==na)
        {
            cout<<"enter at least one phone number\n";
            take_mobile_no();
        }
}
void Phone_No::validate_landline()
{
    if(!landline.empty())
    {
        if((landline.length())!=11)
        {
            cout<<"invalid input\n";
            landline.assign(na);
        }
    }
    if(landline==na)
        {
            cout<<"enter one phone no";
            take_landline();
        }
}
class Personal_Info:public Phone_No,public Name
{
    private:
        void replace_null_value();
    public:
        string email;
    public:
        Personal_Info()
        {
            email.assign(na);
        }
        Personal_Info(string f_n,string m_n,string l_n,string mo,string la,string e_m)
        {
            first_name.assign(f_n);
            middle_name.assign(m_n);
            last_name.assign(l_n);
            mobile.assign(mo);
            landline.assign(la);
            email.assign(e_m);
        }
        void take_full_info();
        void show_full_info();
};
void Personal_Info::replace_null_value()
{
    if(email.empty())
        email.assign("No Email");
}
void Personal_Info::take_full_info()
{
    cin.ignore();
    cout<<"_____ENTER CONTACT DETAILS_____ \n";
    take_name();
    take_mobile_no();
    take_landline();
    cin.get();
    cout<<"\n Enter the E-mail address \n";
    getline(cin,email);
    replace_null_value();
}
void Personal_Info::show_full_info()
{
    cout<<"\n____DISPLAYING DETAILS_____\n";
    cout<<"Name of Contact :";
    cout<<first_name<<" "<<middle_name<<" "<<last_name<<endl;
    cout<<setw(2)<<"Mobile number :";
    cout<<mobile<<endl;
    cout<<setw(10)<<"Landline number :";
    cout<<landline<<endl;
    cout<<setw(11)<<"E-mail address :";
    cout<<email<<endl;
}
class Phonebook
{
    private:
         void save_info();
    protected:
        Personal_Info contact;
    public:
        void search_name();
        void search_no();
        void edit();
        void show_all();
        void get_data();
};
void Phonebook::save_info()
{
    ofstream filout;
    filout.open("data.txt",ios::out|ios::app|ios::binary|ios::ate);
    int ch;

    if(!filout)
    {
        cout<<"\n cannot open file \n";
    }
    cout<<"\n do you want to save this info (1. yes / 2. no) ?\n";
    cin>>ch;
    if(ch==1)
    {
        filout<<contact.first_name<<"~"<<contact.middle_name<<contact.last_name;
        filout<<"~"<<contact.mobile<<"~"<<contact.landline<<"~";
        filout<<contact.email<<"~|"<<endl;

    }
    else if(ch==2)
        cout<<"\n info discarded \n";
    filout.close();
}
void Phonebook::get_data()
{
    contact.take_full_info();
    contact.show_full_info();
    save_info();
}
void Phonebook::edit()
{

}
void Phonebook::show_all()
{
    ifstream filout;
    filout.open("data.txt");
    filout.seekg(0,ios::beg);
    while(filout.good())
    {
        cout<<"\n Displaying details ......\n";
    }
}
void Phonebook::search_name()
{
    int token;
    string field,line;
    char line1[50],line2[50];
    cout<<"Enter the first name of the person you wanna search ?? \n";
    cin.ignore();
    getline(cin,field);
    cout<<"person to be searched is "<<field;
    cin.get();
    token=0;
    ifstream readfil;
    readfil.open("data.txt");
    if(!readfil)
        {
            cout<<"file does not exist";
        }
    while(!readfil.eof())
    {

            readfil.getline(line1,12,'~');
            if(line1==field)
            {
                token=1;
                readfil.seekg(0,ios::beg);
                readfil.getline(line2,50,'|');
                cout<<"the person to be found is \n"<<line2;
                break;

            }
    }
        if(token==0)
          cout<<"\n\n.....data not found...";


}
void search_no()
{
//comment.

}
void gui()
{
    int ch;
    Phonebook p;
    while(1)
        {
            cout<<"********PHONE BOOK***********\n";
            cout<<"1) Add new record\n";
            cout<<"2) Display All Records\n";
            cout<<"3) Search Telephone No.\n";
            cout<<"4) Search Person Name\n";
            cout<<"5) Update Telephone No.\n";
            cout<<"6) Exit\n";
            cout<<"Choose your choice : ";
            cin>>ch;
            switch(ch)
                {
                    case 1:
                        p.get_data();
                        break;
                    case 2:
                        p.show_all();
                        break;
                    case 3:
                        search_no();
                        break;
                    case 4:
                        p.search_name();
                        break;
                    case 5:break;
                    case 6:exit(1);
                    default:cout<<"\n Enter a valid choice";
                }
        }
}
int main()
{
    gui();
    return 0;
}