C++ program for FILE with menu-driven approach

//program to create class Employee
//a) Add new employee
//b) Search Employee record from id
//c) Update an existing record

#include <iostream>
#include <fstream>
#include <stdlib.h>
using namespace std;
class Employee
{
  int id;
  char name[20],address[20];
  float salary;
  public:
    void addRecord()
    {
      cout<<endl<<"Enter ID: ";
      cin>>id;
      cout<<"Enter name: ";
      cin>>name;
      cout<<"Enter address: ";
      cin>>address;
      cout<<"Enter salary: ";
      cin>>salary;
    }
    void displayRecord()
    {
      cout<<endl<<"ID: "<<id;
      cout<<endl<<"Name: "<<name;
      cout<<endl<<"Address: "<<address;
      cout<<endl<<"Salary: "<<salary;
    }
    int getID()
    {
      return id;
    }
};
int main()
{
  Employee e;
  char option,ch;
  int searchID,isFound,updateID,recordID,location;
  fstream file("Menu driven Employee.txt",ios::in | ios::out | ios::binary | ios::app | ios::ate);
  do
  {
    cout<<endl<<"**********Menu**********";
    cout<<endl<<"Enter your option: ";
    cout<<endl<<" a => Add new Employee";
    cout<<endl<<" s => Search Employee record from ID";
    cout<<endl<<" u => Update an existing record";
    cout<<endl<<" x => Exit"<<endl;
    cin>>option;
    switch(option)
    {
      case 'a':
        cout<<endl<<"Adding new record......";
        e.addRecord();
        file.seekp(0,ios::end);
        file.write((char*)&e,sizeof(e));
        break;
      case 's':
        isFound=0;
        cout<<endl<<"Enter ID to be searched.....";
        cin>>searchID;
        file.seekg(0,ios::beg);
        file.read((char*)&e,sizeof(e));
        while(file.eof()==0)
        {
          if(e.getID()==searchID)

          {
            cout<<endl<<"The searched record is:"<<endl;
            e.displayRecord();
            isFound=1;
            break;
          }
          file.read((char*)&e,sizeof(e));
        }
        file.clear();
        if(isFound==0)
          cout<<endl<<"*** Data not Found ***"<<endl;
        file.close();
        break;
    case 'u':
        recordID=0;
        cout<<endl<<"Record is being updated.....";
        cout<<endl<<"Enter employee ID to be updated: ";
        cin>>updateID;
        isFound=0;
        file.seekg(0,ios::beg);
        file.read((char*)&e,sizeof(e));
        while(file.eof()==0)
        {
          recordID++;
          if(e.getID()==updateID)
          {
            cout<<endl<<"The old record is:";
            e.displayRecord();
            isFound=1;
            break;
          }
        file.read((char*)&e,sizeof(e));
        }
        if(isFound==0)
        {
          cout<<endl<<"Data Not Found";
          break;
        }
        file.clear();
        location=(recordID-1)*sizeof(e);
        file.seekp(location,ios::beg);
        cout<<endl<<"Enter new record to be updated";
        e.addRecord();
        file.write((char*)&e,sizeof(e));
        file.close();
        break;
    case 'x':
        exit(0);
        break;
    default:
        cout<<endl<<"Invalid Option";

    }
    cout<<endl<<"Do you want to continue.....?y/n: ";
    cin>>ch;
  }while(ch!='n');
  return 0;
}