Consider the following classes.
class Date

 { private:

  int day, month, year;

 public:

  Date(int d, int m, int y) {   day = d;   month = m;   year = y;  }

 };

 class Employee

 { private:

  int ID;

  int salary; 

 Date dob; 

 Date joiningDate;

 public:  
void writeToDisk(string fileName){}

  void readFromDisk(string fileName, int recordNumber) { } 

 static int countRecords(string fileName) {}

 };  
• Complete the given functions in the Employee class. Use the function writeDisk()
to write data of few employees in a file “emp.dat”.

 • Overload “<<” and “>>” operators for the Employee class.
• Write a stand-alone function void searchEmp(int ID) which accepts ID of an
employee as input, searches for the employee in the file and prints all data of the
searched employee. 

• Write a stand-alone function to print data of all employees (stored in the file), who
joined the organization after the year 2015. 

• Write a stand-alone function to read data from the file, increase the salary of all
employees by 10% and write them back to the file.